These torpedoes can do, as per Wikipeadia, only 370 km/h, which is somewhat faster that 100 m/s, i.e. more than three times less than the speed of sound in the air.
Although I'm not an expert in this, the technology has likely improved since 80's - 90's when it was first deployed. However, if supersonic claim is true, I wouldn't expect any official information about it to be freely available in the open.
Russia has changed a lot in a recent decade and will continue to do so, sanctions might actually accelerate some inner developments that are long overdue.
That is exactly right! Russia knows never to trust the US. Never rely on them for anything!
If the table of the laws where written today I am sure that this line would be at the top .