The problem with this argument that hard core fans will herald this as much to justify the hype is that if someone is a hardcore enough fan they'll already be playing it via the ports already done. Sure some might be excited but it'd be akin to saying "Hey! Here's a game on a platform you're most likely already playing it on. Be excited!"
From a different perspective, I really want to buy this for my ipad. I imagine I will not be alone. This could generate a lot of money and interest for a number of new baldurs gate games. And if the 'classic' versions sell well, or even say become the best game on the platform (which it would be!), this might spur other rpg developers to release their old games or get back into the market.
The adventure game genre certainly got a kick along in a similar way. This has flowed through to the PC and beyond, which has been a great resurgence. As a grizzled old rpg fan who hates the skyrim type approach to the genre, this certainly captures my imagination and interest.
Besides all that, generating hype is not that hard to do for us types waiting for a BG3. Don't pretend that we will not all fall over ourselves every time there is a sniff of a BG marketing exercise
As such they might as well just do it.
.... And finally, maybe part of me wants this to be an ios port because I know I will love it (assuming the iron out a few control issues from the unofficial port). If it was a new baldurs gate game, I fear they would completely screw it up or make it a kart racer