Just having a guess,I think he might be referring to say if one was trying to follow that 401K system, I've mentioned before that's a long term trend thing and that it doesn't make sense to  contribute money to that when market is at highs, but on strong dips like we had in Feb, like we had in 2015/2016, like we had in Feb, and like we just had now down below the 200 MA that's obviously a much lower risk area than when market was at highs.  That doesn't mean price won't go lower over time and the system go red and by the time you get out price wont' be lower than where you got in, but was far better than looking to follow that 401K when market was at highs in late Sept/early Octt

Please realize I'm not an investment adviser, so I'm just talking in generalities and I'm not giving advice.  I'm just following up on comments I've said in the past, if anyone is even following that system, far better to look at major dips than adding at new highs.  

Otherwise longer term my concern is we are so late in a bull cycle, could a bear market be starting soon - could the 401K system flip red say next year and go red at lower prices than now etc?  Who knows. But otherwise I was just having a guess as to why you said that. 

How long term?  A few days/ weeks? I think the bounce forms a lower high so trade your plan.  Nothing wrong with playing long side from deep oversold but trail stops in accordance with your plan.