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It's his second language. I think we can cut him some slack.

It's not like that's even a common mistake, in my experience

"since <duration>" is the normal grammar in German and has the semantics of "since subtract(now, <duration>)" as you would expect

German. "seit" for both.

since we are at time constructs, german also uses "wenn" when english uses "if" or "when".

That's not true.

when - wenn

if - falls (mnemonic: "Fall" means "case" of which this is the adjective)

from constructive corrections, we learn our grammatical, semantical mistakes, hence we move forward to better understand each other.