

It was a 5-4 decision. Thomas agreed with the majority, or rather, his vote constituted the necessary majority.
With this decision the Supreme Court overruled the Florida Supreme Court and effectively stopped the recount of votes, resulting in George W. Bush winning Florida’s electoral votes and thus the presidency. Here you can find a summary.
Whether Al Gore would actually have won with the recount is impossible to say with absolute certainty in retrospect, since the votes were not recounted. However, it was a neck-and-neck race, and numerous indicators suggested that Gore would have won - it was considered likely at the time. And that is precisely why it is scandalous imo that the Supreme Court prevented a manual recount, as this would have made it easy to verify the will of the Florida citizens without any disadvantages.
Overall, I think it’s fair to say that many aspects of this election were rather flimsy.
If you’re interested in the somewhat strange events surrounding this election, you can find the complete documentary “Unprecedented: The 2000 Presidential Election” here. This documentary is a bit sensationalist in places, but it does highlight some of the rather undemocratic methods that were used.
Hope that’s what you were looking for.
Only fitting for the guy - everything he does is based on a lie.