I think your signings are decent. Your point contract is spot on, Gourde I think is 4.5 x 3 (especially if he replicates his success from last year). Vasilevsky I could see making 7M for 6 years. The Cirelli contract is interesting, I am curious to see how he progresses. Raddysh should definitely be ready for an NHL job, same with Foote (though I am not sure about the top pair for him, maybe second pair with Sergachev playing 1st pair).
The Stralman signing is okay, he is a solid defenceman, and i think that is roughly the deal to get it done, however you have Dotchin to play the 3rd pair role (for much cheaper at that), and it may be a better idea to move on from Stralman and use that cap space elsewhere (depth signings or deadline moves). This is purely subjective though, so I don't really have a problem with that.
My reasoning behind the two star rating:
Sergachev contract 3 x 3 is more than a bargain, and I think a bit unrealistic (especially if he continues to improve like he did this past season). I would say he is worth more than that after this season alone, let alone two more seasons to grow and develop. I would think the number for him is 3 x 5, give or take 250k. The signing you are proposing would be more than ideal, i am interested to see what they do with his contract (or whether he is in a package for EK if they choose to acquire him).
My main gripe with this however is the Gourde situation. Your contract is reasonable (a bit under-valued imo but solid), however, after the 2018-2019 season, he is a UFA. Right now, he is only making 1M, and he is definitely worth a lot more than that. If he replicates his success, he could be looking at the contract you suggested at the end of this season (3 x 4.25). While that is a good signing, there would be no room for him unless you traded Callahan, which you have not included in this mock roster. I understand that in the year you are doing this (2020-2021) Callahan is a UFA, but you should still mention the trade you would make for him (or Killorn), because otherwise, one of the key roster players is not on this roster.
MY FIXES:
Add in a Callahan trade (buyout probably wouldn't work, as that would eat too much cap), that way you have the room for Gourde.
Update the Sergachev signing (I could be over-estimating his growth, but I just can't see him taking a 3 x 3 bridge).
Let me know what you think about these changes