Labor had the biggest vote for a single party in the elections.
Just because the fractious LNP coalition votes as a block despite their rabidly differing viewpoints to each other, do you think it's fair to count them as one party while excluding from your count votes that went to parties that tend to (usually, though not formally) vote as a block with Labor?
I think you can only include the LNP Coalition (whoever the candidate is - Liberal, National, Country Liberal, or Queensland LNP) as one party, as in 98 per cent of cases you only have the choice to vote for the single option of the parties of the Coalition. In essence they're one party who represent different parts of the country, Liberal in metro, National in rural, LNP in Queensland, CLP in NT. I think there was actually only two seats where you could vote for either a Liberal or National candidate at the last election, Gilmour and Indi. In the Senate there is only the one option to vote for the one coalition option.
Surely you're not suggesting that someone who previously voted Labor, who decided to vote say Green at the last election, is voting for the same party? They had a choice to vote Labor or Green (along with the other options). That is like saying someone who voted Liberal all their life, who voted Teal at the last election, still voted Liberal.
With the Coalition, there isn't really the option to vote either Liberal or National except for in a handful of circumstances. It's essentially the one party.