PMDG has only modeled 1 cabin which is 12 First class, 42 Business, 316 Economy for a total of 370 PAX (within the FMS). The actual modelling may differ.
Air Canada for example has 2 different layout types.
nice find. looks like it’s just leftover code from the ported plane. surprised this hasn’t gotten more attention, it was one of the first things I noticed on my first flight and confused the heck out of me