Nonsense. Kerry got just over 59 million votes in 2004. Obama got over 69 million in 2008, an increase of over 10 million. Ronald Reagan got 43.9 million in 1980 and over 54 million in 1984, another 10 million plus increase, so that completely shatters the premise of your argument. There's nothing "suspicious" about a party getting a 10 million vote swing. Its happened for both a Republican and Democratic POTUS. Plus, over 10 million of the 17 million you cite went to Trump. You're not calling Trump's votes fraud, and he got a bigger share of the increase. Your argument is completely illogical.
2016 was a record number of votes for Republicans. Democrats hit their record number in 2008. More importantly, the difference between what the highest ever Republican total is currently (73,146,311 for Trump currently) and the highest Republican total was previously (62,984,828 for Trump in 2016), 10,161,483 votes... is a higher number than the same for Democrats (currently 78,712,210 for Biden minus 69,498,516 for Obama 2008), 9,243,694 votes. So since the Republicans record high isn't suspicious, the Democrats record high isn't either.