"is there any reason to think the article is ACTUALLY biased?" Yes, there are actually 2 reasons sir:
First. The refs have absolutely nothing to back up their statements. Furthermore article uses their opinions and estimations, rather than facts. Hence the wording. E.g. instead of "X peaces of equipment was of model Y from year Z" it says "most of the equipment were relics"
Second and most important. The Spanish and Russian articles about the subject ( the actual involving parties ) have no such negative flavour about soviet involvement. Only the English has it. And as we figured out without any facts behind it. Only opinions of the British myth writers "acclaimed academics". 84.52.101.196