The hyperbole of saying "we've been strengthened by 7 players", to then go on to include the completely unreliable/non-entities that are Ings,Gomez, Ejaria and Grujic, is taking the overly positive "everything is great" stance to it's full ridiculousness.
It's already been picked apart well by DG & Fabio, by pointing out that we've lost Lucas, Stewart and whoever else who leaves (Sakho, Markovic, a load more kids etc). There's no increase in depth, if anything we're short in a position we're struggling to buy quality for and now we not only lack the first teamer DM we're crying out for, but we have virtually nothing in reserve.
As said, Salah is great in adding depth, he can play where Mane and Coutinho play, so it gives us the depth we lacked when either one of them were missing last season. The point though is that depth was the second priority this Summer, quality being the upmost requirement and I think so far we've bolstered rather than strengthened, that's not to say Salah won't improve the first team, but it's a luxury rather than a necessity. And therein lies the repeated problem with our transfer policy.