You actually quoting an old post, well accumulating Bitcoin regularly using the DCA strategy will be the best to accumulate Bitcoin so you can be accumulating Bitcoin even when the price is dropping than trying to compare when it's best to accumulate Bitcoin.
If you have a reserve fund and there is a decline in price you can accumulate aggressively making good use of the market dip and accumulate enough Bitcoin and still be doing your normal DCA regular consistently every weeks or months.
I think he actually wants to get some clarifications, so quoting an old writeup doesn't matter, what matters is giving a clear picture of what he wants which you also been able to do to an extent, I think he should understand that there's no particular time that's set aside for people to actually buy Bitcoin, Bitcoin investment is a continues and long-term investment, so we are expected to buy at all time continuously with DCA method of acumulation as you mentioned, if one has to consider buying the dip, such investor must start acumulating first, when the dip occurrs in the process such investors can also buy at a cheaper price but as for waiting for the best time, I think there's not preferable time or period to invest.
Your discretional income should be ready ATL all time if possible so that you can use it to invest if there's any dip but that that doesn't stop you from continuing your normal DCA as you were doing earlier.