Well, Evans and Vernons books use OOP. And when I was interested in the topic (actually it was event sourcing, which seems to be near 100% married to DDD, if you search online resources), I found only blog postings using OOP.
I found it funny, too, because IMHO event sourcing is fundamentally data driven, so FP would be a more natural fit.
From experience I've found it easier in FP languages to get right, and have them stand a few years than standard OO without it being a maintenance headache having written a few of them. So yes - I figured the same thing.
Scott Wlaschin wrote a good book on this topic “Domain modelling made functional” and you can find his talks and articles online. I think this is a decent introduction, https://techleadjournal.dev/episodes/79/
DDD seems to be inevitably connected with OOP, at least I've never read something else.
Hyping one paradigm will lead to using this paradigm in an inappropriate way, sometimes or often.
(FYI: I didn't read the linked blog posting, because of medium.com)