[w3c] Old better than new ?

//--Dear W3C,
     (Mon, 28Feb2022, 22h15) Sorry to return so soon. Now, it's a matter 
of apparent incoherence between validators.
     If you look at this experimental page, where I introduced an error 
on purpose,
/*http://web.tecnico.ulisboa.pt/~mcasquilho/compute/CISTI_2023/sliders.php*//*
*/you get an (obvious) error with "validator.w3.org" and no error with 
"validator.nu". I wrote "kenter" instead of "center".
     So, is the scope of  "validator.nu" only structural ?
     Awaiting your kind news.
     Regards,
Miguel Casquilho (University of Lisbon, Portugal)--//