Well, who in their right mind would say that MP games are dying? I've never heard anyone say that except for specific cases like the classic subs based MMOs back in the mid 2000s.
But other than that there has been a noticeable shift towards MP. The articles wondering about the absence of SP games after last year's E3 were all warranted. E3 was a strongly MP-focused circus. This year probably even more so.
Also consider that quite a few decent SP games have commercially flopped hard since then like Prey or Wolfenstein II. News like the next CoD not even getting a campaign anymore are not surprising nowadays.
SWBF2 got a campaign only because the SW fans whined hard enough but it was a disappointing four hour afterthought of a "campaign".
The signs are clear as day everywhere. Ghost Recon Wildlands has almost exclusively been receiving MP updates since its release. GTA V is only a thing anymore because of GTA Online. Bethesda won't be doing a new TES for "a very long time" because they ain't gonna cannibalize on TESO sales and MTX.
SP is not dead but it is becoming a niche for sure since, as the article states, it requires actual work, effort and content creation instead of just building a level, some basic gameplay and letting loose the dogs to play amongst themselves.