VHF troposcatter?

Yesterday evening I went on 2m  FT8 with my 5W to the big-wheel omni antenna. 

It seems that every time I go on I am spotted at amazing distances. As an example, I was spotted in Poland at over 1000km with my QRP. 

I think my QRP FT8 is copied by troposcatter. FT8  is better than CW or SSB by some way, so I suppose this offsets the antenna gain and power.

It this is true at 2m, I would expect this is also true at 70cm and possibly 23cm.