I believe that tf should not be added considered as netspeak as I’ve seen quite a few people use it already and I know and have heard a lot of others use tf in real life be it in school or just the general public so I would not consider it as netspeak
who the fuck says ‘tf’ irl?
have you genuinely not heard anyone say it?
Netspeak covers all manner of shorthand abbreviations. To name a few examples, including the one eventually shortened to TF
Whether you unironically say them IRL doesn’t change the fact these are netspeak. Type out your words and stop being lazy about it.