I've been an instructor for years, and I encourage people to learn on a buddy box with a conventional trainer (I use mostly an LT-40). But I know a lot of people who have taught themselves to fly, sometimes on glow planes (Kadet Senior, especially) and sometimes on small electrics. It can be done, and people who for whatever reason want to learn that way ought not to be discouraged too much. To be sure, somebody with a .40 sized warbird who thinks he can fly it because he does OK on a simulator is probably in for a disappointment. But the danger to bystanders or to your bank account with a plane like the one the OP recommends is very slight. We don't all have to want to do things the same way.