Oh well - I thought I’d done that successfully before (e.g. in the dog and piano post earlier in that thread), but maybe I’m misremembering. That dog & piano post currently opens to Reddit on both my computer (Safari) and iPhone.
That’s what I regularly do with Twitter, and have done a handful of times with Reddit. But with Twitter links, the embedded video can play “inside” forumosa, without opening a new window. The Reddit links currently do the annoying thing of opening a new window. Maybe they’ve always done that with Reddit, but I hadn’t noticed until today.