Yes, it splits the page horizontally.
The PW (like all Kindles) supports PDF zoom, but not reflow.
Honestly, you'd be wasting your time with a PW if PDF is your primary format. Learn from the experience of those of us who've "been there, done that, got the Tee-shirt"
. If you insist on buying in spite of what we recommend, buy direct from Amazon so you'll be able to return it.