Even then Wilson (from memory) had knocks and was unexpectedly available more than usual, and Isak was largely back for the remainder of the season following his thigh problem and they were never really injured together (at least for long periods).
Aside from Bruno crying because he thought he'd fucked his ankle (only to play a week later), Longstaff missing a game or two with injury, and Willock getting fucked up at Everton I can't think of any other real injuries. The daft cunt is probably counting injuries of players out on loan too - Hayden probably makes up for about 7.4 of that 9.4.