That is one confused review.
(It seems to think Pocketbook Global is somehow related to the old-time Pocket Books publisher.)
It seems to be confusing RAM (not expandable) with Flash storage, too.
It states that the PB360 comes with 4MB expandable to 32GB and then contradicts itself by saying it has 512MB storage (true) expandable to 2GB via MicroSD (false).
The proper satement would be that it comes with 512MB of storage space expandable via microSDHC to at least 16GB. (Not sure about 32GB cards but if 16GB cards work, 32 should also.)
BTW, if you're looking for a detailed overview of the baseline PB360, this is still the gold standard review: