Is the Anglo-Saxon element in England largely overstated?

I am probably about 80% English taking 23andMe and LivingDNA together with most of it coming from Southern and Midlands areas, yet most of my top 20 matches on G25 Ancients/moderns are British Iron Age samples and modern insular Celtic populations like Orcadians. Most modern English seem to overlap much more with Iron Age Britons than they do with EMA Germanics.
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Is this because of genetic continuity or because the mixture of Germanic + Iron Age French puts them artificially close to the Britons?

on G25, insular celtic populations are very close to anglo saxons and northern germanics anyway. orcadians have germanic ancestry on top of that. G25 isnt that good for this purpose. on qpAdm, the english score around 50 percent Iron age germanic, the rest being split between insular and continental celt. the insular celt component is way more similar to the germanic component than to continental celt though.

I guess it depends on what part of England you come from. The way I understand it, the British are most Germanic along the east coast and become less Germanic as you move west.