yes a same season cup quad (we did not qualify for the CS so not possible to win a same season cup quintuple) would have been super
and if we had not choked against Leicester, it could have been a linear cup septuple (in order, win the 2020-2021 FA Cup, then CL, Super Cup, CS (beating Leicester would have qualified us), World Club Cup, League Cup, and FA Cup again, and then run ends there, as we are not in the CL final now) which has never happened,
not even Barca or Real (Real were overall poor in the Copa Del Rey), ever did it,
although Bayern almost did it as well, but they somehow lost the 2019 DFB/DFL-Super Cup, the only time in the middle of a 6 year stretch they lost it