I'm confused, didn't we find out that H.H. Barker designed Merion?
Who's this Macdonald guy?
To the larger point, I think that primary sources are obviously the best, but believe that lacking those, news articles definitely can provide tremendous historical value. They are evidence...not evidence that should be weighed higher than club records, if those exist, but worthwhile nonetheless.
I think great examples exist at Philmont, ACCC (HJ Tweedie), and some other places that were cited.
However, they can also be dead wrong.
I have a news article that says Fred Pickering laid out Merion. Left to itself, one would get a very false impression of the history of that course.
Concord CC (fka Brinton Lake CC) was mentioned here earlier. I have a local news article from opening day that says it was laid out by the superintendent and the pro of the course, not William Flynn.
Thankfully, I did a deeper dive and found other articles that clearly cite Flynn, and even discuss the holes he designed.
I think what I'm saying is let's keep looking, and I think some tremendous materials have been found in recent years, but where it exists, primary, contemporaneous source material of the clubs themselves should be the final arbiter, such as was found recently at North Shore.