CSP rules page in admin not accissible

PHP8.1
M2.4.6-p1
Error when visiting the page CSP rules

{"0":"Deprecated Functionality: usort(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in \/home\/XXX.fr\/public_html\/vendor\/flancer32\/mage2_ext_csp\/Model\/Config\/Source\/Policy.php on line 32","1":"#1 usort() 

Is it a PHP8.1 compatibility issue ?
Thanks