Well.... the poster in question seemed to suggesting that there will not be gaps, or at least not in terms of academics. She works in a university, so maybe she assumes that all kids will be independently working and engaged meaning that all teachers have to do is provide the content! In reality. I think we all know that it's not that simple. A lot of kids are basically doing nothing right now.
No, I am not arguing for the teaching in summer holidays thing, as teachers have been working during this period (how much learning has been going in is another matter, but the work itself by teachesr has been happening). Agree with a previous poster that targeted tutoring (yes, paid, obviously) is the only way out of this mess.
The UK has really cocked this up, frankly. First time the schools were closed, they officially suspended the curriculum.... but some schools did a fair bit of provision anyway, and some didn't, and variable laptop and internet access and the fact that the UK does not seem to have any standardized textbooks meant that the amount of learning was really really different from school to school and from child to child. This time the curriculum is not suspended, schools are told You Must Teach, but the laptop etc. provision is still not really there, and this time round employers have little patience with parents and are telling parents to focus on their jobs.
Kids are going to go into schools with gaps the size of the Grand Canyon. My nephews have engaged with a full timetable will be fine. Other kids are basically playing PlayStation most of the day. The fact that teachers have been teaching means that asking teachers to teach over the summer is now impossible. The fact that SOME kids have been engaging with lots of learning and keeping up to date, means that any attempt to keep the kids in over the summer will go down like a cup of cold sick among those parents who will point out that their kids have kept up just fine, why can't they have a summer holiday?
The schools in the UK really should have adopted a clear "one-way-or-the-other" policy.
EITHER they should have required full teaching and provision from the start, including that first closure last spring, and gone absolutely gung ho with getting the devices and a centralized online school curriuclum out there (or better still, used the BBC and put the lessons on TV, meaning no new devices or WiFi is even required)....
OR they should have done what we mostly did in Japan: shut schools COMPLETELY, with not even key worker kids coming in, told the teachers to basically take their holiday now (the teachers at our school did not really do anything during the closure apart from printing out a holiday homework "pack" for each kid), and made it clear to everyone that school will be in over most of the summer instead, plus some extra hours here and there, until all the usual curriculum hours have been made up for.
Either of these solutions would have worked, just about (without increasing teachers' working hours beyond the normal level). The UK situation is a mess!