UJM, the Chofetz Chaim was against using a razor. That’s all. The whole Kuntres was about the actual Issur.
I am aware that his Kuntres is widely mentioned, but not quoted, as proof of his disparaging shaving, but that’s not what it is. In fact, right at the beginning he wonders — in a footnote — why it is that we don’t trim beards anymore and he gives two reasons.