There are no guarantees that the signal is correct that it’s even ‘a bottom’, though waiting until there is a strong rally following the signal is one way of avoiding buying too early in a series of down days that all trigger the detector, you could still be exposed to buying before another major leg down. I.e. just look at the numerous indicators during the 2008-2009 bear market.
The detector fired moderately strongly twice in July 2008, and there was a bounce after the series of drops that made it fire, so the indicator would suggest buying, with a likely entry ~1250. The S&P500 was ~20% off its peak at that point, so pretty comparable to the current situation.
It took 4 years for the index to finally pass and stay above that buy point again, after the serious selling ramped up in the fall-winter of 2008, dropping the index to ~750, a 40% loss from the rough entry point, and it eventually dropped to ~675 in March 2009. There were a whole slew of firings of the indicator in October and November. If you bought in after the first big up day following the string of market massacres in October, you’d have bought around 1,000, which would have ended up being a decent entry point, back ahead within a year, but still exposed to a ~32% decline to the bottom in March 2009.
The moral of this story might be that if the market is richly valued, and the prospects for the US and world economy are shaky, don’t go crazy off of a firing or two of the indicator, because if the macro environment continues to worsen there could be a LONG way down, and quite a long recovery time.
On the other hand, I have personally backed away from trying to time the market after I botched it badly during the 2020 bear. I’ll just try to ride it out this time. Who knows what the future holds. Maybe inflation will be more cooperative going forward and the Fed can stop raising rates soon, we have a soft landing and this ends up being a mild bear, not a vicious one, and this drop is roughly as low as it goes this time?