CCC - BWM - 002 The City in the Depths

Ran it as a standalone in a convention for seven players, it was TONS of fun. Decided to drop some non-essential combat encounters, and added a magical key. The key let the characters see some of the interactions between the Collector and his friend, the person whose ghost the Collector sent them to save. These visions added a solid emotional layer to the adventure. Saving the princesses was most of what they did in the city, and that helped make the city part of the experience more fun. Sadly, they avoided the storm giant, so they didn't get to tell any epic tales. But it was OK. All in all, very enjoyable.

E-lo! I've run this mod three times now for Adventurer's league and it's fantastic, my go-to T2 standalone mod. I do need a clarification for the Elven Blade of the Third Age, according to the description:
"Elven Blade of the Third Age (+2 Longsword) Weapon (longsword), rare
This curved, single-bladed, hand-and-a-half elven blade is made with a rare alloy containing both mithril and steel. Forged during the third age by the elves of Illefarn, this blade was a favoured weapon for elven Warblades and Bladesingers who long battled their ancient foes, the orcs. Due to the mithril found in the blade, the longsword weighs half as much as a regular longsword. In addition, the blade glows with a cold blue light when Orcs and Goblins are within 300 feet of it."
Based on this description, does this mean Bladesingers can use it? As in, they can add their proficiency to the ATK roll and their DEX modifier to the damage? (basically giving it the light and finesse property like a short sword) A lot...See more of my players have asked me about it and I ruled its just a flavored +2 longsword, hope you can clarify this, thanks!

Are there plans to add a cert for the mod? The descriptive text is really fantastic.