> The 'reverse Monet' (too lazy to link) that caused such an uproar when it was shared last week

I haven't found the HN discussion; I have found a 2017 paper [1] that had relevant examples [2].

[1]: https://junyanz.github.io/CycleGAN/

[2]: https://taesung.me/cyclegan/2017/03/25/monet-to-photo-summar...