I don't recall BG3 going into detail about the Gondians or the Ironhand gnomes. However, I do feel that BG3 stays faithful to canon Dungeons and Dragons lore.
I looked up Forgotten Realms regarding
Gond,
Sarevok, and
Iron Throne.
Regarding Gond:
Gond bestowed upon the people of Lantan the secret for making smokepowder. This allowed the Lantanna to rapidly begin formulation of firearms, which were continually shipped off to purchasers across the western coast of Faerûn. While worship of Gond grew swiftly in the years that followed, the introduction of these new weapons was viewed as a foreboding change in warfare by leads from across Faerûn.
A mere decade later, in the Year of the Banner, 1368 DR, Gond was commissioned by the recently-arisen god Cyric to commission suits of powerful suits of armor to carry out his own schemes. Cyric armed his inquisitors with these horrific weapons of war and initiated the Second Banedeath in cities across the Heartlands.
Regarding the Iron Throne/Sarevok:
On the surface, the Iron Throne was invested in the trade in weapons in various areas throughout Faerûn.While they seemingly sought to form a monopoly of arms dealing, they in fact sought to parlay this martial strength into greater power and rule over the entirety of the Heartlands.
They were known to cut out competition via unhanded tactics like banditry and murder. It was believed that they even stole and dealt in illegal substances such as poisons, smokepowder, and prohibited drugs.
....
Rumors & Legends
Because so little was known about the Iron Throne's leaders, many speculated about their identities. Some believed them to be dwarven nobles that were removed for their seats of power or even a front for the nation of Thay.
