It can be used for that. This policy is not really about welfare though - it seems the opposite.
How will they ascertain abuse in this way?
Do they judge a child's illness when they're in bed? Insist child gets up?
For appointments, they would prefer a child to miss more time as long as they can be marked in the register.
Going against guidelines for time off isn't in that child's or the rest of the children's interests (or the teachers or their families).
Number of children with long covid doubled in the last year, whooping cough is rocketing etc. Investing in cleaner air helps reduce illness and absence - I could get behind that, even if it's just plug in HEPA filters. DfE invested in it for their buildings (as did Parliament, ministry of defence etc). Instead of doing something to change the incessant amount of illness in schools, they crack down on those affected by it. As for quality of learning, do kids learn better when they're well than when they're ill?
Kids in vulnerable situations - are they going to be genuinely helped or hindered by this policy and pressurising for even higher levels of sickness in schools?