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Can I ask what role the paper plays?

Is it that the granules cause health problems?

The filter stops cholesterols which are abundant in coffee.

It doesn’t block cafestol, which increases cholesterol synthesis.

Fun fact: not all cholesterol is bad; it’s only the LDL, while HDL is thought to be good for the heart.

Funner facts; HDL is not protective. It correlates negatively with poor glucose control. That is, people with low HDL have impaired glucose control, but raising HDL doesn’t bring any benefit.

LDL concentration isn’t meaningful at an individual level. LDL particle counts however are. Lots of small LDL particles are way more atherogenic than a few large particles, given a constant density.

I don't think this is true. While it's possible that coffee can raise cholesterol levels, it doesn't actual contain any. Here's what the top result off Google for [coffee cholesterol] says:

Though brewed coffee does not contain actual cholesterol, it does have two natural oils that contain chemical compounds -- cafestol and kahweol -- which can raise cholesterol levels.

https://www.webmd.com/cholesterol-management/coffee-choleste...

So yes, filtering probably makes a difference, but not because it's taking out "abundant" cholesterols.

Additionally, dietary cholesterol doesn't increase blood cholesterol levels for the most part

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