i was meaning, it runs on win10 so why is it discontinued, but they seem to now be with lnl
It's DISCONTINUED not necesarily becasue they're with LnL. Sure, it's probably a contributing factor but if they really wanted I reckon thay could probbaly still support the Matrix versions.***
Generally speaking, I think that Matrix games become "DISCONTINUED" when the devs don't want to continue support, roll out updates, etc. anymore. That may be for several reasons. It may indeed be becasue they're with another publisher, but there might be other reasons, such as the devs have disbanded, died, or the game is simply old. For example, note that Panzer Corps 1 is labeled as "DISCONTINUED," even though the devs are still alive and kicking (FLASHBACK GAMES) and still with Matrix/Slitherine; however, they've simply moved on to another project, which is Panzer Corps 2. Similarly, TOAW 3 is labeled as "DISCONTINUED" because there's no more work being done on it; instead, there's TOAW 4.
To sum up, I don't think that "DISCONTINUED" has any real significance, except that it meanes you should expect no further updates, expansions, etc.
***On the other hand, who knows, there might be some provisions in their new contract with LnL forbidding this kind of suuport... Or maybe they simply have no time to do both versions.