He won in parliament by a landslide majority of around 80 seats, but he increased the Party's vote by only 1.2% over the majority-losing Theresa May, with less

He won in parliament by a landslide majority of around 80 seats, but he increased the Party's vote by only 1.2% over the majority-losing Theresa May, with less than 44% of the vote. There isn't a stable relationship between proportion of the vote won by a party and seats in parliament. Your point isn't really contradicting the parent.