Not necessarily.
If a site such as Thomann sets their price it is likely to be only one currency, probably Euros in their case. When you see it from countries outside of Germany, there is probably an automatic and dynamic currency conversion going on. Hence unless you are checking the price in Euros it could be constantly changing depending on the regularity of their currency conversion system. So you can't necessarily say that "they" have put the price up purely because it appears more expensive to you in England because the £GBP got weaker, or they put the price down in Australia because the AUS dollar got stronger.
I used to do this on Taming The Saxophone. I set the price in £ but customers had the option to view in $ or € and although the £ price was constant, those other currencies fluctuated daily because I had it set to reject current exchange rates. I stopped doing that because it was a pain for a small non-profit to maintain Paypal accounts in different currencies. So now when someone in the US sees the shop they will see GBP only. BUT there is a currency conversion done via Paypl or credit card so their actual price still fluctuates just as if I'd used the currency display.
It is possible that they could set the price for every different currency and change it manually to reflect actual price of the product changes, but I think that is unlikely.
Hence it could be the price in Euros has not gone up but the cost to the customer using a different customer will see changes that are nothing to do with the retail price set by the store, manufacturer or distributor.