Sometimes yes sometimes no. Certain manufacturers require factory training, others require a set number of systems to be installed, or a dealer agreement or a fee. I would ask the dealer why they are not on the list and just see what they have to say.
Installers usually are not on the manufactures website for 1 simple reason. They buy there product through a local distributor not factory direct. We are a Myers well pump installer but not listed on there website simply because we do not buy directly from them. We have been selling Myers pump for over 30 years now, and listed on there site.
I would not be alarmed if they are not listed, but you can always ask your dealer/contractor himself for his explanation.
That means they did not attend training, the interesting thing about bosch is that if you don't attend training you won't have the book to correctly start the system up. i am located in southern NC. Bosch is great equipment you definitely want someone certified when your going to make that kind of an investment
Bosch did buy FHP.
Being listed isn't everything but it helps. It sometimes means that a non-working staff person had enough time to attend a class. Make sure there is some verifiable time spent with those specific models, it does make a difference. Don't deal with "tire kicking used car salesman".