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Specifically how is it biased ?

If you're going to make claims like this then you need to provide evidence.

Because all I can see from the article is mostly a regurgitation of what was in the letter.

my first thoughts as well

newspaper reports on actions employees of major tech company

-FTFY

All you've done here is inaccurately paraphrase him, you've failed to make a point.

The implication of your GP that your parent is implicitly criticizing is that merely having a political affiliation disqualifies one's opinions by default on matters of opposing political matters. I'd agree that was the implication made by the GP, and I'd agree that it's a destructive oversimplification.