I agree with your assessment; that Dalgliesh pamphlet should be taken with extreme caution, or as they say here
I scanned the pamphlet, it's just the cover and two inside pages.
As you can see it's implying that the pre-proscription colours and weaving techniques would have been lost if not for this precious fragment (paragraphs 7 and 8). Note that Dalgliesh had the fragment on loan. The owner isn't mentioned.
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