He was previously not allowed at the table because he was the GM of the Calgary Flames and knows who they would want to target with their picks. However, after the Flames pick 16th Treliving will be able to join the Leafs draft table.
This is huge considering how pivotal Treliving is to the Leafs' future. While he likely will not be dictating the picks, he will be working the phones and brokering trades the Leafs will want to make.