Blood doping in peloton still exists but is different than in 90s. The Athlete Biological Passport become a tool used to calibrate doping strategy by teams. Blood manipulation methods are more sophisticated as the biomarkers used in ABP can detect anomalies in athlete's blood profile.
This video is based on publications below although presents personal opinion on several subjects.

Publications:
ABP: https://rua.ua.es/dspace/bitstream/10...
Carsten Lundby Science of blood doping detection: https://www.ncbi.nlm.nih.gov/pmc/arti...
WADA note about removing default access to ABP profile for an athlete (October 2021): https://adamshelp.wadaama.org/hc/en...
Factors confounding ABP: https://sportsmedicineopen.springero...
Microdosing and ABP: https://www.researchgate.net/publicat...
EPO Microdosing and ABP: https://www.researchgate.net/publicat...
Baesian inference: https://en.wikipedia.org/wiki/Bayesia...

Other sources:
https://www.researchgate.net/publicat...
https://www.sportsintegrityinitiative...
https://www.cyclingnews.com/features/...
https://www.cyclingnews.com/features/...
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https://www.cyclingnews.com/features/...
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