I think the biggest thing these commentators are forgetting is that at heart, Johnson is a populist. He will move his views and decisions to where he thinks he will find the most supporters. The lack of restrictions recently is not a reflection of Johnson getting stronger and deciding to ignore the scientists, or a twist to concern for the financial implications of another lockdown, it's a reflection of the general public distaste for another lockdown. Brand Boris would be more damaged by cancelling Christmas for the second year in a row than the alternatives, so he didn't - if the public had turned on him again - as they did when he was dithering about before calling the previous lockdowns - you can be sure he would have been back behind his desk pifflewaffling about how we need to make one more big push to defeat this enemy.
Boris isn't a champion of freedom, he's a champion of Boris.
I think it is fair to say that he is libertarian as evidenced by his behaviour. Those who behave like he does don't generally have much time for rules and regulations. My suspicion is that be personally would have stuck with herd immunity, but he was too weak to stand up to the pressure to lockdown from the medical establishment (and people on his own side like Gove) so caved, calculating he (ironically) wouldn't survive politically if he didn't.
I suspect he might well still survive despite this, partly precisely because he has no respect for such rules and regulations. I think the comments about drink being inappropriate in the workplace in the Gray Report are significant, in terms of being another ratchet turning of the screw with modern puritanism. It is not too many years since workplace drinking was deemed almost normal. Many [non safety related] companies have followed the railway with drugs and alcohol polices as the general culture has shifted.
Do not underestimate the resentment out there against modern technocratic puritanism. It drove Brexit (and Trump in the USA for which there may well be a 2024 sequel) and may well save Boris as people vote for him partly because of how much it will wind up and infuriate the straight laced, stuffed shirt, league of monstrous and pompous experts, their capricious and ever shifting acceptable speech nostrums and their online censorious mob followers who descend on those who sin against such nostrums.
His swallowing of Nut Nuts green agenda is what is more likely to do for him, if things get really nasty energy wise. Part of the reason for high gas prices is that this winter is so cold in the Middle East and USA that they are using the gas themselves instead of exporting it, to the extent that Turkey, also experiening severe cold, are instituting rolling power cuts. But then in a solar minimum this should not be entirely unexpected unless you are blinded by dogma.