he's long 5 50/60 call verticals with 5 extra long 50 calls: +10 50C -5 60C a "conventional" ratio spread (ShortMore) would be: +5 50C -10 60C and a "conventional" backspread (LongMore) would be the reverse: -5 50C +10 60C
The position simply emulates that of a 'cheaper' long call. Why would you do it when you can just buy an outright call? That's probably why you've never seen this advised. db