The TX financial code does not require validation within 30 days.
It requires the debt collector to respond within 30 days.
Their response can be a statement that they are not yet providiing validation.
The code then requires the debt collector to delete their reported collection, but permits them to reinsert their collection once they do provide the requested validation.
The significance of the 30-day period under the TX financial code is thus its setting of a requirment to delete if validation is not provided.