I think the BBC have misinterpreted the data on this:
The report (and it's not entirely clear how they collected their data, or what methodology was used) actually says:
Secondly, whilst Fridays are the most common day for children to be absent, it is actually those children who miss mid-weekdays, Tuesday-Thursday, who are more likely to be habitually absent from school.
This suggests two separate problems.
Students are most commonly absent on Fridays. It doesn't say if any statistical analysis has been done, so this could be within normal variance, but equally it sort of makes sense- you've had 4 days of being exposed to other people's germs, you're at your tiredest, etc.
And the problem of habitual absence- which actually isn't worst on Fridays.
I do think there's been an increase in absence since Covid, BUT also, Rachel De Souza has an agenda, and I believe she cherry picks data to support this...