He never really competed in Europa and had one great season in 2019, and one good group stage in Europe (which culminated in a very disappointing last 16 exit vs Benfica). Aside from 2018-19 he never won a knockout stage against any decent team as far as I remember, getting knocked out by a weak Roma team, Getafe and Benfica.It's the lamest argument ever made! He competed with Europe bests consistently in the Europa and UCL managing a Europeam traditional giant. To pretend his success was isolated to Eredivisie let alone comparable to one seasom wonder at Porto, no European level impact Villasboas, simply betrays the agenda behind anyone who thinks that way.
Villas Boas on the other hand actually won an European trophy so not sure how you can have him down as ‘no European impact’.
There are many managers who won EL or got far in CL and never amounted to anything serious at the top level.