I stopped playing for nearly a year; just restarted one month or so ago.

When I took my "Armada-pause" they had just changed to Squadrons cap to 100 rather than 1/3 of the fleet cost; did they revert to the old rule (i.e. max 133 points on squadrons in a 400-point list) or can one still invest 100 points max in squadrons.

Thanks in advance.

The squad limit is 1/3 of the max. fleet points. With a limit of 400 it is 134 for squadrons.

The 100 points for squads were with the wave 1 fleet limit of 300 points.

Nothing has changed on this rule.

The squad limit is 1/3 of the max. fleet points. With a limit of 400 it is 134 for squadrons.

So the rule rounds points up then?

Yes

Numbers are always rounded up unless explicitly stated otherwise.

Yep!

Otherwise you'd totally be bracing 1 Damage.