I don't care if it was the real Mat K or fake Mat K endorsing gp swappers from RS3 to OSRS because AFAIK the actual formal OSRS Jmod Mat K don't really play RS3. I don't know he got RS3 gp to swap to OSRS. If he endorsed services he didn't take part in, I don't think it was convincing to me.
To be clear, I was reading a script that was put in front of me, I was not endorsing anything. However, in future I will not be more careful what I read out as I don 't want it to seem like I was endorsing a swapping service.