This is the white paper: https://www.gitclear.com/coding_on_copilot_data_shows_ais_do...

Heise Media states that GitHub has also responded, but I cannot find the statement . According to [0] they say that they did not controll for other factors.

They also published research that makes actually the opposite claim [1]

Tbh I wouldn't trust either study.

[0] https://www.heise.de/news/Schlechte-Code-Qualitaet-durch-die...

[1] https://github.blog/2023-10-10-research-quantifying-github-c...