Whoa!
I didn't see him say that pre-cut patches caused inaccuracies. He said that he was having problems using combinations of pre-cut patches, mixed balls, not cleaning between shots, etc.
How can you know what kind of Pre-cut patches he has access to? Or how old they are? Or what condition they are in? Or even what size they are? ( Thickness and diameter)
His experiences is going to be based on what he has. Without asking more information, I don't think any of us have enough data to judge whether his comment is irresponsible or not.
You have explained how you carefully store your pre-cut patches, and never have any trouble with them. I suspect that the " trouble free" nature your pre-lubes comes about BECAUSE of the care you take in storing them.
Not everyone does that, including retailers, shippers, and warehousemen who throw the stuff into unvented, and non- air conditioned warehouses over HOT summers, where the temperatures may get as hot as your car does closed up on a sunny summer day. 160 degrees will deteriorate any cotton fiber, if you expose the fabric to that kind of heat often enough and long enough. We have heard enough about torn patches on this forum from members to know that some pre-lubed patches( Pre-cut, obviously) don't make it to the range in as good a condition as yours do.
By his choosing to use New Fabric, which he cuts at the muzzle, and lubes at the range, he gets past all those question marks the rest of us face any time we buy pre-lubed, pre-cut patches from any supplier.
I tend to buy mine at Friendship from large suppliers, because their prices tend to be lower, and they sell so many, I can be relatively confident that I am buying new stock, rather than something that has been stored someplace for a couple of years. Even with that "Plan", I have been "burned" at least once, getting patches that were old, and the fibers tore easily.
I have bought my own fabric, and am going to try Dutch's method of lubing them, with both water soluble oil, and with Ballistol, ( I have both), and I might also do some testing using Olive oil, based on recommendations made here.
I have no real need for pre-cut patches. I have a ball block if I want pre-cuts available for reloading in the field. At the range, I have plenty of time to cut my patches at the muzzle. I won't know how much switching to fresh fabric, and lubing my own will improve my accuracy, if any, until after I have completed extensive testing, out to 100 yards.
Dutch is now recommending the use of Ballistol in his Dry-lube formula, because he is informed that the water soluble oil sold by NAPA auto has been changed, and no longer works like as well as the older formula does. I bought my WS oil from a machine shop years ago, and still have a pint left, and more, So I have had No occasion to check at Napa to see what, if any change might appear on the WS oil they now sell.