> not employed by publishers

Full time professional, 20 years of experience.

Keep in mind that 99% of translators are freelance. Translating something takes only a fraction of the time it takes to write the original, so publishers only have full time project managers and editors and hire translators per job as needed.

Engines like Deepl do give very good results on some single sentences. After all, they are huge databases of previous human translations, they are bound to nail it here and there. Where it falls apart is in keeping a good average and a consistent voice, so either you leave it all as messy AI sludge or you rewrite it substantially (at which point it's a glorified dictionary)