This is a huge nothing burger (scientifically speaking). opinions can be opinions, but when science has spoken so clearly, opinions have their own short table in the corner.
If I took you from your entire olmypic athlete life of getting up at 8AM and going to bed at 8PM, then one day randomly I go...today you can't wake up until 4PM....that athlete is gonna still be awake at 8AM the next day. Just like us, plants have circadian schedules and cycles.
You can't change a plant's photoperiod and get the impact the next day...it takes days (multiple) to adjust to the new cycle. The ONLY nuance here is your pfr conversion does indeed accumulate and trigger in a single night. Something you'd never be able to confirm without tissue analysis.
Want a science fact for this? free salts follow a cyclical path from the root zone to the foliage and back. If you harvest accordingly into night, you can nominally reduce free salts in your plant tissue.
The whole '2 days of darkness' or whatever is the same as jail-talk of cracking an egg on a seed or whatever, just folks sharing their experience and anecdotes without placing it into the context of 'hey, this is a plant and folks do science with plants so lets maybe check that out'