No
Candidate Trump submitted a multitude of his "financials" which are much more extensive than a tax return.
Joe Biden provided his tax return, don't really think that he was asked and it is certainly not required.
The FBI and other investigators are looking at actual known illegal activity, they are not on a fishing expedition.
They are investigating possible crimes.
Since Investigation were actually opened and are documented - chances are very high that the info will be included in a criminal trial if and when it moves forward.
Trump submitted his "financials" which were never verified and probably not entirely truthful. These filings were never intended for someone of his wealth and his spaghetti framework of companies obscure critical details about what is actually going on. Trump's taxes would be FAR more relevant.
Biden has provided these exact same "financials" because they're required by law and have the same limitations.
We don't know what the FBI is looking into or who their targets are.
Although we know for a fact that Trump is the target of an investigation in New York which he is using his position to attempt to stop.
But the irony remains that you are demanding public disclosure of details that we have been told for years are none of our business.