Cannot for the life of me tell if this is a serious suggestion.

I've actually done this for a couple commands I screw up often enough -- I have this in my bashrc:

  alias dumbtypo="echo 'LEARN TO TYPE, MORON'"
  alias sl="dumbtypo; ls"
  alias rbuy="dumbtypo; ruby"
  alias pytohn="dumbtypo; python"
  alias brwe="dumbtypo; brew"
  alias arhcey="dumbtypo; archey"

I'm incredulous that 'pythong' is not in there.

I can't not-type it.

You ... type "python"? Not pyt[tab]?

I type pythong all the time, too.

I was worried I was the only one!

if you sudo apt install sl you will have more fun making that typo ;)

there are a couple things I typo frequently enough I've seriously considered it...

It is-- what is the perceived downside?

You have a giant list of common typos, making you a worse and worse typer as years go on, until you are mashing your head on the keyboard to type anything.

I dunno, I don't think that would really happen. I'm always trying to type the same word (I don't say "pish" in my head, after all, I think "push"), so it doesn't seem to be a random walk away from correctness, just some wavering around it. And it's not like I have that many commands I need to type commonly enough to make an alias for-- maybe a couple dozen? And for most of them, I don't make typos so I don't feel the need to make an alias.