But it really isn't. Clinton's lead over Trump was erratic but on average only a few points and she never reached over 50% support. Biden's lead over Trump has been consistent at about 6-9% since March, with him regularly polling over 50%. The amount of third party party support in 2016 was significant enough to be polled, in 2020 it is pretty much irreverent. In 2018 the turnout was the highest for 100 years, the anti-Trump vote was at least as motivated as the pro-Trump vote.
Trump may still win,
the electoral college is biased in his favour, but he is in a worse situation than he was in 2016.