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I have an amateur friend who says that he found an article on Games Workshop website that says that Tau can freely ally with imperial knights as long as a few adjustments are made. He won't send me a screenshot because his google just crashed. I this bs? I don't believe him but I wanna give him the benefit of the doubt.

Your friend is spouting bull-hock. Follow the Allies Matrix-Imperial Knights are part of Armies of the Imperium.

Your friend is correct actually. Any faction can ally with any other providing you adhere to the limitations set out in the allies section of the rule book. Your friend could use a Tau Combined Arms Detachment and an Imperial Knight Oathsworn Detachment, for example, and be perfectly within the rules for a Bound army. He could even take a unit of Fire Warriors, an Imperial Knight, a Rhino and a unit of Chaos Space Marines and have a perfectly legal Unbound army. What he can't do is take an Imperial Knight in the Lord of War slot in a Tau Combined Arms Detachment because most detachments require that all units in them are from a single faction.