As a newbie I would be grateful if someone could tell me exactly what this means.
What this means is that most of the cheap flash stuff sold on Ebay is junk. It's made down to a price, it's sold at prices that people can't resist and it isn't built to perform, let alone to last.
One thing to consider is electrical safety. The product may or may not have the "EU" sticker on it, but if it does then it means nothing, because the factory will happily print it on there regardless of whether or not it meets the safety standard.
"ROHS" printed on the case may impress some people, all that it actually means is that the product is SAID to comply with rules on things like mercury content. Again, it's meaningless.
We get a few people on here telling us that their cheap Ebay lights caught fire, or blew up, or that the power adjustment doesn't work,or that every time they flash it it produces light of a different colour/and or intensity, and then we get others saying that they are perfectly happy with theirs.
There are various possible reasons for this disparity.
Firstly, nobody actually knows who makes the Ebay junk, there are a very limited number of casings used, and all of those casings are shared between a large number of manufacturers, so there is no clue there. Even if they are taken apart (definitely not recommended) there are no clues inside either, because they all use generic parts, and many of those parts are recycled. So, a fairly decent manufacturer may produce a reasonable product, but another one that looks exactly the same may be a dangerous pile of badly performing junk...
Add into the mix the fact that many Ebay sellers dabble in all sorts of things, they know (and possibly care) nothing about studio flash, they don't have any kind of repair facilities and their products only need to last until the customer has left feedback, or for 1 month, whichever is the longer.
Of course, you will never find any user reviews on the web. The reason for this is that these products are sold under so many different names, and the names change so often, that no one name is around long enough to cause problems for the sellers.