Volo's Guide To The Sword Coast is set about a century after those 3rd edition books, which both precede the Spellplague. Bridgefort didn't exist (was built after) both the FRCS and SK.#Realmslore
— Ed Greenwood (@TheEdVerse) August 4, 2020
I think you got confused with the 5e book Sword Coast Adventurers Guide, Volo’s Guide to the Sword Coast is a 2e book, and set in the mid 1360’s ish. I just found it strange that that was the only mention of it that I could find. Everything we know about the Realms is via unreliable narrators. Volo in particular. ;}
I made him so to give DMs leeway to change anything they want to, but also, TSR gave me impossibly large areas to cover per wordcount in each Volo's guide. So a LOT is left out.#Realmslore— Ed Greenwood (@TheEdVerse) August 5, 2020
This holds true for nigh every 3e era Realms product, and beyond. Hence the blizzard of web enhancements on the Wizards website, when e-publishing finally became possible; we finally weren't limited by what could fit in a physical book. Note the "mouse type" in 2e products.
— Ed Greenwood (@TheEdVerse) August 5, 2020