I thought I might share a small phonetic game/challenge with you. All 3 individuals in the attached clips were born and raised in the same country and speak the same native language. Can you tell, based on the peculiarities of their English pronunciation, what language it is?
It’s not initially obvious but there are hints. Especially with the last and first one (2nd is teaching English peculiarities in slang so is an overly forced accent), but they all appear Slavic-ish too. 20 years ago… immigration from only one country into England comes to mind and that’s Poland so their first language is Polish.
Note that it wasn’t the accent that made me choose there. It was to say they weren’t native English speakers
spoiler
Your deduction is correct. They are Polish.