This is what he posted:
"Two main statistics have been used to count coronavirus (COVID-19) deaths in England: death \registrations involving COVID-19 (reported by the ONS) and deaths within 28 days of a positive SARS-COV-2 test (reported by the UKHSA). The 28-day measure is a timely measure of COVID-19 deaths to inform public health response, but less precise than death registrations which consider the cause of death.
When compared, the 2 measures closely tracked one another (85 to 90% correlation) between May 2020 and December 2021.
85% to 90% correlation would mean covid death stats were over-stated by up to 15%.
You’re definitely gonna need someone to explain this to you. Ask your mom, perhaps.
I wonder what part of "The UKHSA (28 day) measure under-reported deaths at the very start of the pandemic..." is unclear to her folks.