Um CBS and Paramount are the ultimate arbiters of 'what's canon'in the Star Trek Universe. They can decanonize or reconanize whatever they like (Much like Disney did with the Star Wars EU.)The canon database is an unreliable source of information. The statement stands, no conclusive evidence. A stronger statement of authority on the matter is needed. Referencing licensed material into an episode does not make everything in that licensed material canon.
Also, realize that the ONLY reason TAS was decanonized (in 1987 as TNG was in production) at the time was because Filmation was claiming anything they created for TAS was owned by them and if (at the time) Paramount used anything from TAS - they were owed a royalty.
So, instead of having some writer possibly add something from TAS that Filmation might make a claim/court case on - Paramount said TAS is no canon - and writers should use NOTHING from it whatsoever in making future Star Trek scripts.
Once Filmation went belly up and the rights reverted to CBS/Paramount - bang...TAS is canon again.