Burke probably used a copy negative to make postcards. Which is the way to go on something more mass produced, as it saves wear on the original negative. Especially if he sent them out which might be possible as AZO made loads of photo postcards.
I get why a Burke wouldn't be a type 1 as a postcard, but overall I don't see any reason a photo postcard wouldn't be. Nearly all of the ones that weren't produced for a commercial use were made from the original negatives very soon after development. Clarity of the image doesn't indicate much for those, just like it doesn't mean much for film snapshots taken recently.
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