There is a lot of confusion and consequently misunderstanding about facemasks.
Official guidance is that facemasks do not protect you against the risk of catching Covid 19. Guidance does state though that if you wear a face covering, it may help to prevent the spread of the virus if you happen to have it.
In situations where it is mandatory to wear a face covering, a simple handkerchief fixed in such a way that it covers both your mouth and you nose will keep you within the law. To that extent, any facemask which does that job, including the one mentioned in the OP will be sufficient as far as compliance is concerned.
However, 3M do not claim that their 3M 9320 + FFP2 is effective against coronavirus, but I believe it is fair to say that it would be more effective in helping to prevent it spread than a handkerchief.
www.3m.co.uk
And with that, I'm afraid that I'm turning off the comments for this thread.