You've not listed all of their forwards though and that's 4 players compared to the 5 I listed. If you add in Trossard and Nwaneri then that's another 7 goals. Bringing Arsenals quota up to 30 goals compared to our tally of 18 goals. It's a pretty big difference. We all have eyes, we've all unfortunately had to watch the last 2/3 seasons of woeful attacking quality. We all should know that we've got a very weak attack.
Here's a combined table since our League Cup win against Newcastle. This is when Rashfords purple run of form ended and when our attack officially failed. I've removed clubs that have been promoted/relegated since then to keep a consistent group who have played the same number of games. I've sorted the table by GF.
Rank Club
Games
W
D
L
GF
GA
GD 1st Liverpool 81 53 21 7 189 86 103 2nd Man City 78 53 13 12 179 79 100 3rd Arsenal 79 50 17 11 178 72 106 4th Newcastle 80 39 14 26 164 118 46 5th Tottenham 78 34 12 32 151 128 23 6th Chelsea 79 34 19 25 144 121 23 7th Aston Villa 80 39 20 20 137 114 23 8th Brighton 81 29 25 25 132 125 7 9th Brentford 80 27 17 35 125 124 1 10th Bournemouth 79 31 16 31 114 122 -8 11th Fulham 78 28 18 32 114 119 -5 12th Nottm Forest 79 26 19 33 113 126 -13 13th West Ham 79 28 18 32 111 147 -36 14th Crystal Palace 79 27 22 29 111 109 2 15th Man Utd 79 35 14 30 107 112 -5 16th Wolves 79 24 13 41 100 146 -46 17th Everton 79 23 26 29 87 110 -23
TLDR: Our forward line is genuinely atrocious.
It's probably the worst in the PL. Bar Amad I would have no problem replacing each and everyone of them. Including Garnacho.