I too would query the OPs deductions, because most modern very well insulated houses, and those with insulation retro fitted do not have these problems. Most plastic framed double glazing has a trickle vent at the top of each window to enable the house to ventilate.
I would have a lot more respect for Insulate now and ER if they had published a fully researched, peer reviewed report that showed how their irrational and unreasonable demands could be met in any reasonable time scale. For the insulation -rentamob- group. I would expect them to have fully assessed materials and methods to be used so that we have no more tragedies like Grenfell tower or find houses suffering damage or becoming dangerous to live in because of the use of unsuitable materials and methods.
I usually have some respect for protest groups but I have none for ER and Insulation Now. Both groups are johny-come-very-very-latelys to the party. There are a large number of responsible environmental groups from The Green Party and others who have received a lot of respect and media coverage for raising concerns on Climate Change for decades now, before a year or two back, ER came into existence.
We are already at a stage where on some days half our electricity comes from carbon neutral sources. In fact today 60% of the power we are using, as I write, is from carbon-neutral sources (wind, solar, hydro, uclear) gridwatch.co.uk/
ER and Insulation are a rentamob crowd of the disaffected, who were looking for a cause and thought Climate Change would be a good band wagon to climb on.