No. Tsukushima deleted Zangetsu's past with his Book of the End which has been explain to
change the past. Yhwach may have taken the powers from Ichigo, but Tsukishima created an alternative timeline . (Both Yhwach and Ichigo have their powers in the present.) The sword and the shinigami are connected, if it's restore so those his powers. Which means that he still haves his Hollow merged ability, but he can't used. Remember what he said, he had to use Yhwach's reiatsu to awoken that power. He still needed to master it, is not a weaker form. He regained his powers back.
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What happen in the end with his shikai looking sword could have been another transformation, just like he could merged with his hollow powers, maybe his sword can merged with his quincy powers and look like that. But of course this below is just expeculation. Wherever he is stronger and master his bankai after 10 years is speculation, since that is the normal time needed to master a bankai according to the Shino Academy.