Of course it is against the Lib MSM’s code of “ethics” to ask a Dem a followup question such as you the one you posed.
Talk radio, Breitbart, Daily Caller, Townhall, Bongino Report, Dr. Pieczenik and other conservative outlets all need to jump on this. This is a strong indication that they either feel compelled to lie about the cognitive tests or they are extremely scared of Biden having to take one.