~I personally think that playing in free-to-enter tournaments is bad for your knowledge of the game, but starting from a $1 buy-in you can get a good initial practice, and then move to a $10 buy-in, which is actually better.
Yes, it is so. I tried free-to-enter, free-rolls tournaments, even won several times, but i understood fast enough that i see mostly newbies that try to bluff without strategy or playing as it was written in the book "How to win poker in 3 days". In $1 buy-in i saw not so many "allin-ers" but the quality of players was really low. I`m not serious player but it was boring even for me. Now i play with $5-10 buy-in and it is about my level. But i feel that i need increase it to level up my skills and spend much more time playing.
$5-$10 buy-ins are about my level too, and although you can still see those all-inners in such tournaments too, you can simply ignore them, because there's only a few of them, one at a table or even less. You can't be ignoring them if there's half of the players like that.
Yes, it is easy to ignore several, always there are someone who ready to catch them.
Nope. I`m not high level poker player. Even on my level to level up i need to spend much time in game and i haven`t so much time. And now i can watch or read different free courses and watch videos of top-players as @Betwrong says. But i can suppose that there are some paid courses(not these ones the OP try to sell) that can help to understand some moments on really high level.
As you mentioned, you do not have time to spend on playing the game, so there is no use spending money on any Poker course, whether it the one which OP is selling or any other paid course. The best thing you can do is to learn from free sources and practice whenever you get the time.
You can always buy paid course later, when you feel that you got interest in the game and you think that the paid course can be more beneficial (but first you need to learn from free courses).