That is interesting; this is the sort of thing I'm always noticing in new codex releases, too, because I generally try to keep my collections lore-friendly as well.
It could just be one of those gradual scale-ups they do over time when a previous example in the background seems to be boxing them in. I've noticed other instances of this on occasion - for instance, I believe the 5th(?) vanilla Marine codex gave precise numbers for each of the different vehicles in the chapter's armoury - an exact count on the number of Rhinos, Predators, Thunderhawks, etc.
...Nowadays the chapter organization charts just tend to say "Predators" and "Thunderhawks" and leave the hard numbers out of it, which I find kind of interesting (but also a little frustrating).
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