The article misses the simplest technique:

Just donate blood as often as possible. This results in a loss of cholesterol, other bad lipoproteins, excess iron in those who have it, and PFAS toxins. It is frequency-dependently associated with longevity.

Whole blood donation avoids the plastic lining of plasma donations, with the latter undesirably transferring unwanted microplastics into the body.

For those with sufficient spare money, instead of donating blood, just get various blood tests every other week, additively comparable to a donation if the tests are substantial.

Granted, this is antithetical to being a vampire, but you will still have to make up for it by supplementing sufficient healthy nutrients, e.g. electrolytes, ferric pyrophosphate, protein, etc. to allow your body to quickly restore the lost blood.

As a disclaimer, do not ever donate blood if you use narcotics, disallowed drugs, injectable drugs, or have unsafe intimate practices, or might have chagas or TB or even long Covid.