I can’t tell from those pics, looking only on my phone that I look at too much and thus gets harder to look at.
But just wanted to note that a friend of mine who gets paid to attack Tree of Heaven regularly suggests NOT cutting them at all but rather applying a strong basal bark treatment to the bottom of the stem. He says this will kill more of the root system and not stimulate as much sprouting as a cut stump treatment will.
Cutting without any treating at all will get you more root sprouts than even Black Locust would send up.