I think I’ve done Tong about three times on a hardtail. It was totally fine and I think expert class first year it was in nationals was won on a hardtail.
Some of the drops and chutes they could use for the nationals might warrant a dropper, but there will be a B-line for those sections anyway.
Thing I found most difficult on a hardtail, moreso than descents, was actually keeping the power down on the rooty sections where a full squish would just power straight through.