Why PSV had this devastating loss?

I'm impressed by this result. I didn't watch the game but being beaten by 7 goals is out of this world (and Arsenal had no strikers!). I know Arsenal is a great team, but previously PSV won against Juve, Liverpool and drew agaisnt PSG and Rúben Amorim's Sporting.

Quite disappointed as I thought they would put up a tight fight. Tactically, what went wrong?