No, they also fail even that test. Neither Meta nor DeepSeek have released the source code of their training pipeline or anything like that. There's very little literal "source code" in any of these releases at all.
What you can get from them is the model weights, which for the purpose of this discussion, is very similar to compiler binary executable output you cannot easily reverse, which is what open source seeks to address. In the case of Meta, this comes with additional usage limitations on how you may put them to use.
As a sibling comment said, this is basically "freeware" (with asterisks) but has nothing to do with open source, either according to RMS or OSI.
> This is a debate that started, like, twenty years ago
For the record, I do appreciate the distinction. This isn't meant as an argument from authority at all, but I've been an active open source (and free software) developer for close to those 20 years, am on the board of one of the larger FOSS orgs, and most households have a few copies of FOSS code I've written running. It's also why I care! :-)