Was there a pre-Anglo Saxon germanic migration into Britain?

[Rietto66]

I've found this very interesting youtube comment:
"Although the People of The British Isles (POBI) Project results said that the DNA of the English was less than half Anglo Saxon, one of the clusters which accounted for 40% of the DNA of the English (North France Eu17 cluster) is closer to the North Germany Eu3 and Denmark Eu18 clusters than any other clusters (the North Germany Eu3 and Denmark Eu18 clusters were the clusters used to represent Anglo Saxon DNA). In fact just before the final report was published they had grouped these 3 clusters together to represent Anglo Saxon ancestry but then changed this saying that they believed that the DNA from the North France Eu17 cluster was from a pre Roman migration. But even if POBI were right and it wasn't from the Anglo Saxons and from an earlier migration it was still from people of the same stock and Germanic. Therefore the English are predominantly Germanic."

Is he right about this? I don't know that much about genetics.

Yt comment I'm referring to:https://www.youtube.com/watch?v=_iVdy0s8ARE&t=187s

[J. Ketch]

Probably not anything significant. But some of the Celtic and Roman era British samples look like they're mixed with Germanic, so there was probably a minor presence - considering Germanic lands were just across the water that's to be expected.

It's possible also that the Belgae (that invaded SE Britain) had some Germanic influence.