This is specified as an exclusion criteria in the Supplementary.

No they didn't. They excluded those that got the vaccine pre-May 2021 or those that got another vaccine besides Pfizer or Moderna.

	▲	biophysboy 34 minutes ago \| parent [-]
		The target trial emulation specifies "individuals deceased or vaccinated during the 6 month grace period between the index date and the effective start of follow-up" as an exclusion criteria