Let me give an alterantive perspective. Let's hypothetically assume that the two female top skiers (the outliers) in the Norwegian team, with the help from a shady team doctor decided to go down the enhancement alley. The strategy was to use stereoids where a solid scape goat was at hand if caught. They decided to use the good old out of fashion Clostebol where the Trofodermin ointment would do the work if caught. When one of the two outliers was caught in september 2016 they had to go with another alternative with the grand ol' lady. If caught with heightened levels of testosteron, no plausible explanation to give. With Nandrolone, both pig meat and Primulat-N pills would work.
While claiming "I am not defending Norwegians, and IIRC, even Dr. Jim Stray-Gundersen (of Norwegian origin) didn't defend the Norwegians when he reviewed their HB-data in 2018 for the Swedish media" you sure seem quite eager to find whatever supports Marit.
It would be interesting to know if there exists any data on how succesful the "pig meat"-defence has been in the past or whether Primolut-N or pig meat can account for presence of any of the nandrolone metabolites (there exists more of them than the one present in Bjørgen's urine).
To summarise in Oxford-style why I don't find anything overtly suspicious in the 2017 case:
1) There is nothing debunking the narrative that she took the incident into public voluntarily knowing that her presumably favourable treatment would draw some attention. If it was a coverup, this would be sheer stupidity. Had the origin of the story in the media been someone else, the situation would've been completely different.
2) Only her last sample (apparently) was positive for a relatively easily detectable steroid. It was not trace amounts remaining after a miscalculated glow time from a steroid patch/microdose she took weeks before the 2017 Games. Had the positive taken place in the first doping test, again the situation would've been completely different.
While some cyclists have (presumably) microdosed steroids during the multiday stage races, even one proven case of someone consuming nandrolone shortly before an almost 100 % certain doping test would help your hypothesis or someone testing positive during a stage race / Championships after having tested negative a few days earlier. And again, testosterone is by a magnitude more difficult to detect, no explanation for presence in a test because it won't come back us a positive.
About who I defend and who I don't -- whether I generally think that there is something suspicious in the Norwegian XC-skiing miracle is one question, whether I think that Marit Bjørgen is a doper another one, and whether I consider the 2017 incident suspicious is yet another one. There is no tribalistic reason to see them as answer all in positive or negative.
That having been written, I do think that she is on general level suspicious as hell.