No. If anything, it is likely to help. Thrombosis is clotting of the blood, and a low-carbohydrate, high-fat diet reduces the glycation that makes blood likelier to clot. On top of that, the insulin response to carbohydrate interferes with the body’s production of nitric oxide (NO), which is the primary chemical the body uses to keep blood pressure low. So with blood that’s not so “sticky” and arteries that are more relaxed, you are likely to have less trouble with thrombosis, not more.
I suspect that what happened before was simply bad luck. You were already on the road to thrombosis, and weren’t keto long enough for it to head it off. But that’s a what-if, and the key point is that it is likely to help, if you can stick with it for a while, this time.
I’m glad for your recovery, and I hope you continue to do well. Be sure to let us know from time to time how you’re getting on.