No New York isn't competitive but the point is that its incredibly significant that a presidential candidate especially a Republican is willing to go to the South Bronx which has traditionally been very hostile turf to the GOP. Like sure Biden could go to Kansas, but would he be willing to go to say Wallace county for a campaign event (not government business)?
This is fundamentally a false equivalency - there's a dramatic difference is in population, and even in the Bronx there are more than enough Trump supporters to fill up a stadium; a lot more people will be reached out to. Wallace County, otoh, has very few voters at all, let alone Biden voters. The Bronx had 67,000 votes for Trump in 2020, whereas Wallace County (where he won 93% of the vote) gave him just 770 (Biden only won 44). There were, in other words, 87 times as many votes for Trump in the deeply Democratic Bronx as there were in the heavily Republican Wallace County, and 1500 times as many Trump voters in the Bronx as there were Biden voters in Wallace County.
Now do you understand? The issue is less that it's deeply Republican and more that there are literally so few people to reach out to. If UT continues trending leftward, it may actually make sense to hold a rally in Utah County, in spite of it being a deeply conservative bastion, because it still has a pretty large number of voters, including Democrats (Biden won just 26% of the vote there, but that still came to over 76k votes).