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For understandable and repeatedly stated reasons, such things should either be implemented at the software level or not implemented at all. Moreover, the question of whether such a rule is necessary is debatable – in my opinion, there is nothing wrong with trying to find the right hero. If you have accumulated more gold and time, you have a greater chance of finding it, which is fair. But to introduce it in the middle of a tournament, completely ignoring the opinions of the participants, is beyond the pale. Moreover, it introduces even more uncertainty and provokes a lot of controversial situations. If you bought a leveled-up hero on a short timer and placed him in the chain, is that a technical exploit? Or if you bought him and used him to gain some advantages, is that a technical exploit? What if you bought him and killed an opponent's weak unit? Where is the line between what is allowed and what is a technical exploit?
In general, I have nothing against Vik and his tournaments (quite the opposite, actually), but I am strongly against this particular rule.