FDA clears blood test to aid evaluation for Alzheimer's disease

Nothing beats a good bloodletting.

There has been no correlation between amyloid and AD since 2008. The rest was all faked.

That's a huge exaggeration of what the article you linked to says https://www.science.org/content/blog-post/faked-beta-amyloid-data-what-does-it-mean

The faked line of research was regarding Lesne's line of papers on a specific amyloid beta protein configuration AB*56

Proteins can be folded in any number of shapes, any of which can have different effects.

The OP's article states:

The blood test uses high-resolution mass spectrometry to measure the ratio of levels of amyloid (Aβ42 and 40) and two forms of tau protein (p-tau217 and total tau217) in the blood. These biomarkers are associated with amyloid pathology, a characteristic feature of Alzheimer’s disease.

As a layman, I see there's a difference between AB 42/40 and AB 56