But this isn't a demand from his opponents for disqualification, but a request from his team for a substitution.

The former is the responsibility of the Arbitration Committee, and the latter is the responsibility of the tournament organizers.

In our case, a substitution with a player from another team (if that's what you mean) is not possible; this is a fundamental principle that was taken into account when the tournament was organized, as there was a draw, and a transfer period during which players were exchanged between team pools. Now, only a replacement of those who have dropped out of the tournament with those who did not register during the registration period is possible. And this substitution is equivalent to disqualification. If all deadlines are not observed and all kinds of substitutions are allowed, then all the previous rules, which everyone was aware of, are worthless.