Welcome aboard Zero_Niner
Bearing in mind the QRG is from 2017 but I looked at what you're referencing and I can understand the confusion. Alpha seems to suggest the top row of number keys on your keyboard rather than the numeric keypad (if applicable) which is keypad
Number Row Keys and Commands:
1: Weapon Sensor
2: Weapon Search
3: Weapon Depth
4: Activate Torpedo
Shift+4: Cut Wire
No binds for: 5, 6, 7
8: Radar Mast Raise/Lower
9: ESM Mast Raise/Lower
0: Periscope Raise/Lower
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