From what i figured in the past, they want you to believe that is the case as they earn their affiliate commission from you clicking through - however, years of ordering hardware especially avoiding to click and going the "extra mile" of going manually to the respective website and searching for the product there yielded exactly the same price as advertised on Geizhals.
https://www.csv-direct.de/artinfo.php?artnr=AGX1428619&KATEG... (758,93€)
then look at the geizhals price:
https://geizhals.de/ubiquiti-unifiswitch-enterprise-24-rackm... (748,09€)
After you have visited the page from geizhals, the lower price will stay even on direct links, for that product only (until you clear local data/cookies).
Incidentally, i've bought RAM from CSV-direct sometime last year, after getting an alert from Geizhals... not sure if i clicked through with the link from the email, the price however did match...
FWIW, it's enough to just set the parameter &pva=geizhals2 in the GET request for the product page once. Could be fun to see how regular it is.
For example a shop where I have seen this almost always was jacob.de.
However, I have not bought many computer parts during the last year, so I do not know if this still happens today.
A couple of years ago, it was certainly very frequent.