Can you use parroting to make a tupper? Sure. Can you use Fede's thing to make a tupper? Sure yeah, it looks like a valid method because honestly, anything is valid if you feel like it's working. All a mental thing, so you could probably make a tupper by doing anything if you were convinced you would get a tupper out of it.
Should you do it? Only you can tell. One thing I'll say is that how much you force per session isn't the limiting factor unless you find yourself finding it difficult to focus if you just do short sessions or something. The same goes for long sessions, what use is an hour long session if you only are focused for the first ten minutes or so? With short sessions, the advantage is that you can put it anywhere in your schedule and can't feel lazy. If you knew you had to get off the computer for an hour, you'll probably push that further and further away until the day is done. But if you have to do ten minutes now and ten, you'll find it much easier to just leave and go do it. Depends on what kind of a person you are and how long it takes you to get in the mood.
As for Fede's beliefs, the main thing that differs is that his definition of a tulpa is much wider than ours. He says tulpa, he means pretty much anything in your imagination no matter how separate or independent it seems. We say tulpa and we mean a thing that should feel like another person and definitely has fooled us into thinking that they really are. Despite what he says, he doesn't really seem to think that what we want out of a tulpa is impossible. Some tuppers he likes more than the host and seems to wish that they take over so the host wouldn't spend as much time in the real world, so that seems to imply to me that the tupper in question is given some kind of personhood in his eyes, as they could replace the host person. Similarly when it comes to some tuppers, they can have pretty normal conversations without Fede going on about his belief things. Many of the newer tuppers tend to get to taste his opinions, though.
And can't forget how his own tupper back in the day would do a lot of stuff on her own even if it was something Fede didn't like, like creating a wonderland when he was very against that kind of stuff and only finding out about it later. So there's some irony about the guy with the very separate-feeling tupper saying these things.
