I'm just wondering how you can get back the points that I lost this week and last week due to canceled matches, and how this will be implemented in the FPL.
You don't get back those points, they are lost. That is why it is very important to have strong bench at the moment and then you get auto sub and hopefully at least some points. Still not enough to get full 11 playing probably but better than nothing.
There will be lots of double and maybe even tipple game weeks this season. Meaning there will be a week when some team will maybe play even 3 games. Perfect opportunity to use bench boost or triple captain chips and score some enormous points.