no, the discussion is about what the Tories will do and how it works with the electorate. They are ruthless. The point about 1990 and 1992 is that getting rid of a leader is easy for them.
Actually when you think about it the last 3 former Tory PMs were all brought down by splits over Europe.
Cameron had to promise a referendum to keep the Eurosceptic faction quiet - he lost, he went.
Major - sure he was eventually kicked out in a general election, but he was a lame duck for years prior to 1997 due to the splits in his party over Europe - remember him resigning and seeking re-election, and remember his comment about Eurosceptics in his cabinet as bastards.
And of course Thatcher - although the external perception was about the poll tax the key internal reason she was knifed was over Europe and the knifer in chief being Geoffrey Howe - remember his killer comment over her attitude to europe - "It is rather like sending your opening batsmen to the crease only for them to find the moment that the first balls are bowled that their bats have been broken before the game by the team captain."
Who is to say that the Tory splits over europe won't claim a 4th PM scalp in May. I think she will find it impossible to reconcile and satisfy the three wings, pro-EU, hard Brexit and soft Brexit and whatever she does she will have two factions gunning for her - at least Cameron, Major and Thatcher had the somewhat simpler task of managing just two factions.