If Taylor hasn't certified the Kytch product to safely integrate with the Taylor product, it seems reasonable for Taylor to say it could cause problems. If they said it will cause problems, that seems a bit different.
Irresponsible? I don't know, maybe? What responsibility does Taylor have to Kytch in the first place? Certainly no obligation to say "Their product is safe to use on our machine."
Defamatory? I don't think so, but I guess the courts will decide.