No, Nimrod can change/adapt. As a super-intelligent machine, he's able to develop new technologies (i.e. weapons/strategies/etc.) to deal with threats.
This is from Marvel's bio of him...
Known Superhuman Powers: Nimrod is the most highly advanced form of Sentinel robot possible for the technology of his native time period and reality to create. It is not known from what materials Nimrod was constructed, but his robotic form is highly resistant to damage even by superhuman beings. Nimrod can convert his outward appearance to resemble that of an ordinary human being. ***Nimrod can also reconstruct himself so as to make improvements in his robotic form and internal systems that will make him a more formidable opponent.***
Unless you're talking about the much lesser known Nimrod who is a vampire...Doubtful, but him and Bloodstorm might make a cute couple 😍
lol...
-DM