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Of course anyone investing regularly into bitcoin, such as weekly, he will likely ongoingly see his bitcoin holdings to be increasing on a weekly basis, whether it is going up or down in terms of its dollar (or fiat) value.
so in some sense the bitcoin account amounts can be considered as a kind of savings that may or may not end up going up in dollar value with the passage of time... and surely we hope that 4-10 years or longer our bitcoin account will be in profits, even if we also realize that i tis not guaranteed to be in profits, but it still may well have a lot of value, whether it is in profits or not.
what JJG is saying that anyone who investing in bitcoin regularly such as weekly and not monthly he or she will be ongoingly see his or her bitcoin holdings to be increasing on a weekly basis, wether it is going up or down in terms of it's dollar or fiat value, that's to tell you that if you patronise the weekly DCA your bitcoin holding will increase more than the monthly DCA.
And for second paragraph of JJG what his saying there in summary is that 4 to 10 years or longer that our bitcoin holding will be in profits, that even if we also realized our bitcoin holding is not guaranteed to be in profits that it still may have a lot of value wether if it's in profits or not.