In fact, nothing prevents us to lay a custom layer of gathering the entropy over (u)random, so all the issues mentioned in that article can be easily circumvent

In fact, nothing prevents us to lay a custom layer of gathering the entropy over (u)random, so all the issues mentioned in that article can be easily circumvented. If I had a license and enough money to buy Gryada-3 module, I certainly wouldn't look into any pure-software solutions.