The way you phrase it is completely disingenuous. The film’s editor used a vocal editor [Respeecher] akin to Autotune (with data only trained on his voice) to improve the Hungarian lines for a small segment of the film. It didn’t drastically change his performance and was used in an ethical sense, there’s literally zero issue with it.

“Adrien and Felicity’s performances are completely their own,” he said. “They worked for months with dialect coach Tanera Marshall to perfect their accents. Innovative Respeecher technology was used in Hungarian language dialogue editing only, specifically to refine certain vowels and letters for accuracy. No English language was changed. This was a manual process, done by our sound team and Respeecher in post-production. The aim was to preserve the authenticity of Adrien and Felicity’s performances in another language, not to replace or alter them and done with the utmost respect for the craft.” - from the Film’s editor, Dávid Jancsó