This means the Athena Exclamtion is superior to the Libra weapons. Now for context, literally None of the Libra Saints, or indeed, Gold Saints in general want to use the Athena Exclamation, as it’s highly dishonorable to use it on a single opponent, which is what was happening. It’s always the absolute last option, as it’s usually considered a very dishonorable technique. Even though the Libra Saints participating in the Athena Exclamation have all their weapons, they’d still rather use the AE. So I’d suppose the Athena Exclamation would be 6 times Stronger then the Libra Weapons, as 3 Gold Saints can wield 6 of them in total, and they still would rather use the Athena Exclamation(Which Again, is only used if all other options are futile).
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The problem is that the example you use comes from the anime continuity and something different was seen in the manga continuity, for example in Saintia Sho, the Gold Saints (Aiolia, Mu, Shaka, Aldebaran and Milo) preferred to attack with the Libra Weapons to destroy the comet Neo Repulse with the power of three gods. Also in the Wailing Wall we could see that the Gold Saints (Mu, Shaka, Dohko, Aiolia and Milo) preferred to concentrate all their cosmos in the Libra Weapons, instead of using the Athena Exclamation combined with the power of the sunlight. The Gold Saints only use only one weapon on most occasions, because they concentrate all their cosmos on that weapon.
The Athena Exclamation is only the power of three Gold Saints at the maximum at a single point.
The Libra Weapons in the hands of a Gold Saint, is the maximum power of a Gold Saint focused on the weapon, plus the power that this weapon possesses, plus the power that the Cloth gives to its user (because the weapons are made of the same material as the Cloths).
The Athena Exclamation is stronger than one Gold Saint using one of the Libra Weapons, but probably no stronger than three Gold Saints attacking with three Libra Weapons at full power.
but Camus ice coffin could withstand the the power of several gold saints combined. The libra sword could cut it like better.
The description of the Freezing Coffin of Camus is just hyperbole or exaggeration within this story, as this was broken by Hyoga's power with absolute zero and the 7th Sense (a power that is weak in comparison to a Golden Saint such as Gestalt), and the Ice Wall of Hyoga, described as equal or is probably even superior (Hyoga describes it as comparable to the Freezing Coffin, although we know that Hyoga is much more powerful than Camus), was destroyed with a single blow from Minos, the weakest Underworld Leader in terms of physical power.
Elite Gold Saint (Saga, Kanon, Abel, Cain, Shaka, Shijima, Aiolia, Kaiser, etc.) >>> Suikyo => Ox level Gold Saint => Wynver (the most powerful of the three leaders) >>> Ikki with 7th sense >>> Griffon and Garuda >>> Hyoga with 7th sense >>>>>> Camus.
in SSO; The Libra Sword could damage the Cataclym slash but the AE needed to be Uber Amped with the power of Omega + The soul of Genbu to destroy it + the AE had to be focused into the part that the Libra Sword Damaged.
At that time the Tenchihōmetsuzan was in Hyperion's hands and as he described this weapon only released its true power in his hands, when Genbu damaged this weapon it was in the hands of a Pallasite like Aegir. Also, the Gold Saints were fighting against the full power of this weapon in that attack.
