I obviously can't tell you how YC will respond to your video, but I find it very unlikely your accent is incomprehensible if your American cofounder said it was fine.
If you fall closer to the second example, then American English speakers may have trouble understanding you clearly, but if you fall closer to the first, then I can't see anyone having a legitimate problem understanding you.
But again, I'm just trying to address actual comprehensibility issues. I can't say whether YC will respond positively or negatively.
Here's an example from the site I linked before that I would consider completely comprehensible: http://dialectsarchive.com/russia-5
This, on the other hand, is probably pushing the limits the comprehensibility: http://dialectsarchive.com/russia-13
If you fall closer to the second example, then American English speakers may have trouble understanding you clearly, but if you fall closer to the first, then I can't see anyone having a legitimate problem understanding you.
But again, I'm just trying to address actual comprehensibility issues. I can't say whether YC will respond positively or negatively.