No, those are not Red Legion ships.
If anything I'd say they could be either a Loyalist fleet or a Blind Legion fleet.
English
-
<The Blind Legion joined the Red Legion>
-
They fell under the command of the Red Legion (same as all local cabal forces) but I don't recall ever reading they were assimilated.
-
<I'm sure they were but fair enough.>
-
The Red Legion just took over, none of the legions present in the first game assimilated into the Red Legion. The Legion took control as the main cabal fighting force in the Sol System. (most likely with the scout legions on Mars resuming their mapping and digging)