It could be sure, but at the same time there wasn't any direct implication that the Gura's user must utilize specific conditions to perform this feat, like Sengoku didn't make any mention of this and neither any other guidebooks (which they would definitely mention if it was the case), so its still feasible to assume (for now at least) that those statements are meant to rappresent the true extend of the Gura's raw destructive power.
And as Quake users have show that they can infuse their quakes into their physical attacks
be punches or
their weapons,
as well as having some degree of AoE control so that the full force remain concentrated rather than disperse all over the place, meaning its more than likely that when fighting without holding back both WB and Teach can dish out attacks on that level of power, and because of how Admirals and Emperors are treated as relatively all Top Tiers should scale to this.