You can use them....just don't say anything about it. He never said you can't or shouldn't. If you're in a close knit FC and everyone is ok with openly using 3rd party tools...that's ok. Just be careful if one person in FC might not like your harassment of low DPS shown in a 3rd party tool.

I personally don't use one (PS5), and I'm ok with it. And if I have an FC member saying something to me about my DPS I will mention it to the FC leader, and if they don't drop the issue then that FC isn't for me. And that member will be banned as I will say something.

Again, it's ok....just keep it to yourself, because as soon as you say something to someone, you just broke the terms of service. Which is a ban able offense. Don't be surprised