From the linked article:

“As 2024 begins, the parties are closely matched based on political party identification and leanings. However, Democrats are clearly in a weaker position than they have been in any recent election year. This is based on the new low percentage of U.S. adults identifying as Democrats, as well as the Republican advantage in leaned party identification.”

So ‘liberal’ does not equate to Democrat politically. Liberal in the traditional enlightened sense is also more Republican aligned.