It's not possible to block that information with FSUIPC.. It's the red or white text on green background messages that FSUIPC can block, not the red on clear background text.

This is just the FSX.cfg

 

Take the FSX.cfg and rename it FSX.cfg.orig then restart FSX. You will be going through all your addon permissions again, this is normal. then let us know if that fixed it.