Zoro needs to git gud then, invisibility is a part of Shiryu's powerset. Fights consists of more than AP and Sanji whooped Absalom's ass who had that fruit anyway, if Shiryu was only a df merchant Zoro should dispose of him without getting his ass whooped. So if you agree he's getting his ass whooped, then that already makes him impressive.
The point is about Shiryu posing matchup problem and not amounting to Zoro, which isn't a slight on Shiryu but just acknowledging how powerful Zoro is currently.
Will Shiryu perform as well as Rooftop Zoro even against 2 Yonko, let alone KoH Zoro? That's the question that needs to be answered, which is very likely no unless he too is a CoC Swordsman like Zoro.
The Hide & Seek ass whooping isn't really indicative of their overall level because Shiryu is very likely inferior to Zoro in CoO, CoA, CoC, Swordsmanship, physical stats and a whole lot more but will push Zoro on the backfoot purely due to his inability to counter Shiryu's DF.
Zoro needs to git gud, yeah. That's gonna be the crux of the fight, not surpassing Shiryu or anything. After this fight, we are looking at Zoro being a Swordsman with 3 Advanced Haki forms. All that's left is to split the sky at that point. Shiryu has done pretty much nothing to say that he's comparable to that.