Dear oh dear oh dear, indeed.
OK,maybe the bigwigs of ACI did originally write that every 1m passengers creates "UP TO" a certain number of jobs but it is still meaningless gibberish from a statistical point of view.
Aside from another whinge because you don't like Ryanair, I think you need to take up the issue with ACI if you dislike the figures
ACI have stated something and that has been quoted and credited with it.
Here is a number of airports with jobs per million passengers, doesn't look the 1000 figure is that much off the mark.
LHR - 67 million Pax, 76,000 direct jobs, 166,000 indirect
LGW - 32 Million Pax, 28,000 direct, unknown indirect but given hotels and guest house employ 4,000 around Gatwwick its probably double that
MAN - 19 Million passengers, 19,000 directly employed and 42,500 sustained
SNN- 1.6 Million pax, 2000 employed, plus 500 direct offsite, no numbers on sustained
CDG - 61 million Pax, 87,000 directly employed