I suggest we don't revisit the discussion of this rule – it seems to have been decided once and for all: you can resurrect a fallen enemy hero on the day of their death and any day thereafter. What's the point of trying to catch and destroy the opponent then? This isn't prohibited anywhere – neither in the tournament rules nor in the FAQ.
The phrase in the tournament rules: "it is also forbidden to buy fallen heroes (not to be confused with those who fled)!" applies only to your own heroes, but not to the opponent's heroes... This is exactly how it is worded in the FAQ in relation to your own heroes – otherwise, I, for example, couldn't interpret this rule. This is the default condition. If the rules of the current tournament require prohibiting the resurrection of an opponent's hero (which is quite reasonable, as it is left to the discretion of the organizer), then the prohibition must be explicitly stated: "Resurrecting destroyed (or fled) opponent heroes is prohibited".
Formally, there was no prohibition at the start of the tournament.
After VDV's response, I was also plagued by vague doubts, but I attributed it to my long absence – I thought the guys had changed something. It turns out there is a catch.
If it's not a secret, what caused the early submission of the final save?