Russian 5 Rublej - Nikolai II coin gold content

According to https://en.numista.com/catalogue/pieces20953.html 5 Rublej - Nikolai II coin contains 86.4 % gold. I believe that it is 90.0 %. I own such coin (1898) and few years ago I asked one of my friends to do an XRF analysis of it. The result was 89.92 % with a small experimental uncertainty ( 95.4% confidence interval for value between  89.73 % and 90.11%).

 

Here is what SCWC 1801-190 (6th Edition 2009)  shows:

Probably the same thing apply to 7.50 Rublej ( en.numista.com/catalogue/pieces17820.html ), 10 Rublej ( en.numista.com/catalogue/pieces18722.html ) and  15 Rublej ( en.numista.com/catalogue/pieces23407.html )

Somebody should also check if the silver content (0.480 and 0.864) of Nikolai II silver coins is correct. Who is responsible for correcting errors? Should I do it myself?

Unfortunately, the catalog referee for russia seems to be in hiatus, according to this thread. So nothing can be done right now regarding changes in coin sheets.