I wouldn't say it's all about the engines. Sometimes even relatively low rated players can be very good experts in a specific opening. They may know all the ideas, the history, typical tactics, literature etc. and thus they can produce pretty good analysis. Certainly it's also about dilligence and about how much time these guys are willing to invest in their opening examinations. If you study the analysis of the said 1900 player you will discover some pretty deep ideas, which your engine won't reveal unless you enter some of the critical moves by hand. 
As another example, take bragesjo. His level of expertise is far beyond what you would expect from his rating and he has produced astonishing ideas on a regular basis.
So Geck0, don't think that a 1900 rated player can produce nothing of significance.

Fausto Alava-Moreno wrote on 09/12/11 at 13:29:38:

Can somebody enlighten me why everyone is so eager about analysis made by a chessplayer with a FIDE elo of 1900 ?

No offense, yet I don't get it at all.

The file is online again.

When I try to open the cbv files, i get

"openingtheory.co.cc has expired"

I have a copy but unfortunally only a multifile version in chesbase format and only pgn and txt files are allowed in addition to only allowing one files to be uploaded.