

It is somewhat misleading but not false. He did vote against it as the linked article also points out.
English tl:dr for those interested:
He did vote for an earlier proposal that would have made marital rape illegal but allowed potential victims to block an investigation.
Critics feared that abusive spouses could force their victims to block investigations.
That proposal ultimately failed, a new version without “veto” was proposed, Merz voted against but it ultimately passed.
His entanglements with various lobby groups aside, Merz is just a terrible politician.
Merz is not a diplomat or negotiator he just wants to be the boss and give orders.
That is not how you get things done in a coalition government or in parliament.