His model is using negative energy. The only scientific models I know of that allow negative energy to exist in large amounts, without being woo-woo, are within black holes...

Another commenter here put this scientist's credentials into question. Additionally, they linked his original paper here, and the conclusions are pretty weak:

"The analysis also showed a possible intersection with a model developed in the context of general relativity to understand how hyperfast stellar travel might be manifested mathematically. The qualitative correlation would suggest that a chip-scale experiment might be explored to attempt to measure a tiny signature illustrative of the presence of the conjectured phenomenon."

Key takeaways: he doesn't have a mathematical model for FTL travel to work from (he also calls it "hyperfast", which could be an attempt to lower the bar). He only has a "possible intersection" where his experiment only gives a "qualitative correlation". This is weak for such bold claims... And, the phenomenon he's still looking to measure is only "conjectured".

I also saw a picture of his device, and it looks pretty scrappy for such precise electromagnetic measurements. The anomalies he claims to see could attributed be any number of mundane error.

I didn't read the whole thing, due to how weak the conclusion section was... But here's the article: https://idp.springer.com/authorize?response_type=cookie&client_id=springerlink&redirect_uri=https%3A%2F%2Flink.springer.com%2Fcontent%2Fpdf%2F10.1140%2Fepjc%2Fs10052-021-09484-z