The paragraph before it says this: “Therefore I want the men everywhere to pray, lifting up holy hands without anger or disputing.”

So that too must be just a letter and not a doctrinal command from god.

And Paul says “I don’t permit.” Not “You shouldn’t permit.” So it’s also how the rest of the Christian church was run. It wasn’t a special instruction for Timothy because of special circumstances. Not that ANY circumstances justify such a prohibition.

“Don’t allow heresy.” is fine. Paul doesn’t doesn’t prohibit Men from teaching heresy or dressing immodestly. (The excuse some give is this was a letter because of the Cult of Artemis.)