We can safely drop "biased" from the quote, because an unbiased view is a mirror. A useless thing.

> statement is only true for the rather small subset of things that can be scientifically investigated

Science is not a reality, it is one more view of a reality. It is easy to see if you look at the history of science. Scientific beliefs come to be replaced by others. Phlogiston is not real, it existed as a scientific belief, but ceased to exist when the belief was debunked.

> the observer cannot be removed and any beliefs come from the observer in the first place.

Yes, we cannot talk about reality without being observers of reality. We cannot talk about reality itself, we talk about beliefs/illusions/whatever.

> even if you do not believe in meditation yet, it can be observed in yourself and in others.

I do not believe in it, I tried it and what I believe it is impossible and people fake it. It is real but as a myth: I do not believe in this myth but it exists nevertheless, so it is real.

> the observer cannot be removed

Doesn't it mean that reality doesn't exist without an observer?