Clearly cheating. Just compare first round with second round. If you add all the conservative votes in the first round to Bolsonaro first round you should get close to his second round total, but instead you get -5% in at least two of his strongholds where he should have gotten ~60% of the vote.

In the 3 "toss up provinces" Lula magically got +2.5% from the first round despite insignificant left-wing competition in the first. Which implies that 2.5% of the conservative voters in these areas suddenly decided after 30 days to switch their votes from hardcore conservative to leftwing commie. Not credible.

Looks like Bolsanaro votes got siphoned off in his strongholds and in tossup areas. Possibly same algorithm used in US to siphon off votes out of conservative counties and switch them to Biden votes.