This is via /r/MapPorn (in turn, I think, via /pol).
Overall, the map strikes me as quite accurate.
Portugal didn’t strike me anywhere near as Black as the UK, I would have put it at not much more than 1%.
I think France is a bit too high, probably because it includes the overseas departments. Accounting for that may lower its figures to something like 5.5%. But it’s been more than a decade since I was last properly in France, so can’t say for sure.
I don’t think Poland has fewer Blacks than Russia. Warsaw had more of them than Moscow. My guess is that Warsaw is ~1% subcon and ~0.1% Black, hence ~0.3% subcon and ~0.03% Black nationally. Moscow is 10-15% non-Slavic, overwhelmingly composed of Caucasians and Central Asians, but with Blacks specifically at 0.05% at the very most (so more like 0.01% nationally).