I have never fancied myself a math guy but according to the numbers in the article the GOP has 1.6M registered voters and the Dems have 2.52M. If the Dems had a 2:1 advantage, I believe then they would have 3.2M registered voters...
About 5-6 years ago during the Trump admin the Dems had the most registered voters in the State, surpassing independents. That advantage has been totally erased as the GOP adds voters and more voters register as unaffiliated.
This is good news for the NJGOP moreso in next year's State elections than this year, where their only real opportunity to have a good night will likely be if Kean, Jr. wins. There are no realistic pickup opportunities for either party except for Dems in Kean's district.