I don't think the author was implying that Barlcay Bank was intentionally using Internet Archive by using the term "CDN". But, per your suggestion, if the titl

I don't think the author was implying that Barlcay Bank was intentionally using Internet Archive by using the term "CDN". But, per your suggestion, if the title was something like "Barclays Bank using Internet Archive's bandwidth to load their JS assets" then it's essentially the same thing as saying they're using Internet Archive as a CDN. A CDN is there to deliver asset files to websites, which is exactly what Internet Archive was doing for Barclay Bank in this case. The author used the term "CDN" to describe the situation or position Internet Archive was in relation to Barclay Bank. Also using the term "CDN" would make it easier for people to understand what was happening just by reading the title.