Everything has been explained in this YouTube Video.
TLDR
I've installed a few software's today that change the UI from the default Steam interface to the iconic 2017 one, and I joined a VaultF4 server the same day after I finished installing that, and I realised I couldn't speak or write, that is because the plugin that VaultF4 uses on their TF2C servers (SourceComms++) thinks that having a software changing the Steam Interface is some type of cheat possibly or something else that triggers it to mute and gag me.
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