I said "form factor." I'm still happy to support new smartphone platforms: if anybody ever carves out a large enough market for an iOS / Android alternative that we can justify supporting it, I expect we'll do so. It's very much in our interest to have Pleco available on multiple smartphone OSes, both to avoid relying too heavily on a single partner and to expand our addressable market. But I don't think that anybody who buys a Vision Pro will not also own an iPhone on which they can run our iOS app, so we wouldn't be expanding our addressable market at all by supporting it, nor would we be reducing our dependence on Apple - in fact we would be increasing it.
The one thing I would consider in the near term - before we actually know if visionOS is going to be a success and if "running windowed iPad productivity apps" is something people keep wanting to do after they've owned the thing for a few months - would be to offer the iPad version of Pleco on visionOS as a monthly subscription app. (with that added eye-tracking feature, but only that) I generally dislike subscriptions, but I would adopt them here in order to have the ability to wind that app down at a future date without anybody losing access to something they'd purchased. Since the addressable market is so tiny, this would probably also be fairly expensive - say US$15 or $20/month. If enough people indicate that's an amount that they'd be willing to pay in order to use Pleco on their Vision Pro, I might consider going that route, but I'm pretty firmly against the idea of offering any version of Pleco on visionOS for free.
EDIT: I should also note here that at the moment, the release version of Pleco is still our creaky old version 3 - which uses a lot of weird old custom controls and is an absolute usability disaster both on Catalyst and on visionOS - and while 4.0 beta is coming along nicely, it's not going to be finished when Vision Pro launches. So even if I were absolutely champing at the bit to launch a free version of Pleco on Vision Pro, it would not make sense to do so until 4.0 is out, and that makes it pretty much impossible for us to be part of the first wave of visionOS compatible apps.