I'm concerned about the cuts but this article isn't worth reading if it's not going to talk about our realistic options.
What happens if we don't increase our defense spending to match NATO targets? In light of our general lack of military spending, the US's aggression, Russia's aggression, and the way that China is posturing towards Taiwan, it quite frankly seems like to would be asinine to not increase our defense spending.
If you want to make the argument for taxing the rich to maintain both, then do so, and explain how you will do so while preventing capital flight, but this author is just listing cuts to government departments because that sounds bad and not bothering to actually think through or make any judgements on our realistic paths forward.
Based on the reasoning presented in the article, and having heard Carney talk a few times, I'm fairly confident he has spent more time seriously considering our options than they have.