It has never been debunked. It indicated the top this cycle literally the day before it happened (coinbase IPO).
Pi Cycle top is a free live data chart for Bitcoin. This indicator has picked the top of previous $BTC market cycles to within 3 days.
www.lookintobitcoin.com
I agree, no one indicator is infallible, but it was not the only reason I sold my BTC/crypto. All the garbage pumping, NFT, etc were all obvious euphoria/topping signs.
This thread (and also stock market thread) are also a good gauge for sentiment. When it is increasing by 20 pages a day full of noobs ready to throw money at total junk, we are probably near a big top. When it is totally dead, with 1 post every couple of weeks, it's a great time to buy.
Nobody wanted $3k btc or $100 eth.
Everyone wants $60k btc and $4k eth. Lol. Cycle will always continue.