I am not really too keep on any kind of an idea of using DCA for withdrawal, and sure, some might consider sustainable withdrawal as an exit DCA, but that seems a bit misleading to me, and in some sense there is not really any need to ever completely exit BTC, so the idea of sustainable withdrawal relates to abilities to perpetually withdraw (or live off your BTC or draw an income from your BTC) once you have reached a status of accumulating enough BTC, yet better yet if you have reached a state of overaccumulation, then you can likely pace your withdrawal so that you never run out of BTC...so yeah maybe in the beginning there would be more cushion or more conservative withdrawal and then if you see that the bitcoin is largely holding its value or increasing its value, then you could increase the withdrawal amounts. I do have some things that I need to fix and/or tweak in some of the withdrawal formulas in that thread and in the withdrawal tool too.
So the best thing to do is to stick to your bitcoins already accumulated even after reaching your target. You shouldn’t use the withdrawal strategy just because you’ve accumulated and reached your target but also look at the market factor like checking the current value of bitcoin if it’s holding or increasing in value before you apply the strategy if you ever wish to withdraw some of your holdings at some point. The goal should be never to run out of BTC in your portfolio and take advantage of the market when it dips even after taking some profits and keep accumulating for another cycle where it may have reached another point of all time high before you’ll want to sell off some part if the need arise or if not, continue holding.