The term developed, I think, because the rest of non-Bitcoin crypto also goes in cycles. Many of those folks aren’t really all that aware of the Bitcoin halving, even though the usual pattern is a Bitcoin price spike post-halving, then some of that money rotates into ETH/etc as the Bitcoin run-up loses steam, then as the ETH/etc run-up loses steam the shitcoin/memecoin/garbage pump starts.
Lots of the ETH/memcoin bros don’t really think about Bitcoin’s halving so they just see a cycle, even though it’s driven by Bitcoin.