He's wrong on all parts. The arrests were about the technology being leaked to the Chinese, the "kinzhal missile" the notoriously unreliable Klitschko is proudly standing next to in the NBC photos he linked to is a BETAB 500.
The Ukrainian air force itself even denied that any Kinzhals had been shot down:
Your source is from May 5th. Subsequent Kinzhals were confirmed shot down much more recently.
> On May 4, 2023, Ukraine used a U.S.-supplied Patriot battery to down a Russian Kinzhal missile, which Russian President Vladimir Putin had announced in 2018 was a “hypersonic” weapon that could overcome all existing air defense systems. Russia’s state news agency tried to maintain this claim by arguing that the shootdown was a fake report. Yet just 12 days afterward, Ukraine shot down six Kinzhals [1] that Russia fired in an assault on Kyiv. Both shootdowns have been verified by U.S. government sources.[2]
The Ukrainian air force itself even denied that any Kinzhals had been shot down:
https://news.yahoo.com/ukrainian-air-force-denies-reports-13...