I dislike Johnson as much as the next person but raking over this stuff is not particularly important.
Missleading parliament (again) and then lying about it, you see as “not particularly important”?
He should be heavily fined and banned from working in public office ever again, as a bare minimum.
Imagine if you did something at work that warranted a disciplinary investigation, contrary to your own policy and then you lied during the investigation.
You would be fired, no questions asked.
Aside from setting a very dangerous precident for how much crap MP’s can get away with, he was the PM at the time.