That's completely irrelevant to the false claims being bandied about regarding the level of support for each party in the UK. The level of support is reflected in the actual percentage of votes received, not the number of seats allocated by a faulty system. And that goes just as much for the times when Labour seizes control with a minority vote. The system needs to be reformed so that the allocation of seats represent the actual choices of the voters.
Ironically for you, Johnson himself wants to reform the system, although I don't know exactly how.
And with the parliamentary numbers he has, he can actually get reforms through. A party without a majority can do very little - as you saw with Theresa May's government.
Another irony is - a huge irony if you ask me - is that Theresa May likely had the better deal and it would have been a softer Brexit. But the politicians either couldn't accept the will of the people or couldn't make up their mind. And this happened because TM had no majority - she had no power to get anything done and had to rely on the opposition, which is why nothing worked.
Since Labour and Lib Dems blocked or obstructed any possible deal - even TM's arguably better and softer deal, we now have BJ who is going to ram through a hard deal. And the reason he can do this is that he now has the majority that TM would have loved to have.
In any case, there is no perfect system of government. As far as I recall, South Africa's system has you voting for a president, with MPs selected in proportion according to the number of votes that a party receives. The problem with this is that you do not have representation in government - there is no MP for Sandton or MP for Centurion. In the UK, if you have a problem, you can write to your MP and they will sort it out for you, take it to government if need be. This isn't possible in South Africa, and people are unhappy.
So I don't disagree that the UK system is unfair, but, 1) its unfair to Labour too and Labour has used it to their advantage in the past, 2) it has the benefit of representation at local government level, 3) it tends to result in majorities, which if you ask me are beneficial because the worst kind of government is an ineffective government like TM's government.