Nixxes is strictly a studio that does ports, not remakes.
More specifically, since their inception 20 years ago they only did ports of Eidos games, and since Eidos was purchased by Square Enix in 2008 they've only been working with Square Enix.
To summarize, what Nixxes only ever did were ports for studios that belong to Square Enix: Crystal Dynamics, Eidos Montreal and IO Interactive.
https://de.m.wikipedia.org/wiki/Nixxes_Software
That said, I wonder if Sony really intends to drastically change what Nixxes has been doing for 20 years (e.g. working with FromSoft), or if there's something else brewing here.
If they are going to do more than ports they may well have to expand significantly. Only info I can find on size is pretty sketchy. One source listed 21 people. Another indicated the company had 50+ employees. Maybe contract vs full time. I would think you would desire more personnel to do both new ip and continue working on ports. But hey, I don't have any way to back that speculation up so, Dead Sea sized grain of salt.