I was curious (and tediously bored at work) so I went and checked our results on the Premier League website for last season.
This is every game we failed to score in. 13 in total. I've highlighted the ones I'd argue we probably should have done better in given possession%, number of shots and...
I don't get this 'untested' thing.
Bissouma 'replaced' by Caicedo / Ali Mac both of whom have played PL games for us and performed well.
Cucu replaced by Estupinan who looks like he has a clanger in him but has played Champions League football and spent three years in the Spanish top flight...