16,000 Bitcoin Dormant Since 5+ Years Suddenly Moves, What’s Going On?

On-chain data shows 16,000 BTC, which have been dormant for 5-7 years, have finally shown some movement on the Bitcoin blockchain.
5-7 Years Old Bitcoin Age Band Has Made A Large Move
As pointed out by an analyst in a post on X, a large stack of dormant coins has moved across the network today. The relevant on-chain indicator here is the “Spent Output Age Bands” (SOAB), which keeps track of the movements of the various Age Bands on the blockchain.
“Age Bands” here refer t