BitCoin Gold will launch Oct 25th, and is basically someone's attempt to "cash in" by splitting the chain. The SegWit2X Improvement will activate around Nov. 18th, and as I understand it, could be another split point in the chain where a group may attempt to continue mining on the "unimproved" block chain to create another coin.
Is that accurate?
You are correct, the Bitcoin Gold fork is a different one from the SegWit2x fork.
Bitcoin Gold plans to replace Bitcoin's original Sha256 proof-of-work hashing algorithm with a new, ASIC-resistant hashing algorithm.
SegWit2x plans to double Bitcoin's blocksize, which will lead SegWit2x to split from the original blockchain. Be aware that SegWit2x is a move away from Bitcoin's original development team.