It could be the case that some pump group is preparing to pump that coin and is first buying large quantities for themselves, but like I said, can't be sure.
Yes, pretty strange for a relatively unknown cryptocurrency.
That could be a real order that someone wants to buy a large amount at that price but equally, if the price gets there the order could get pulled. Painting the book is a practice that's been part of trading for a very long time, now more commonly called spoofing as it is automated by bots.
You mean the guy didn't really want to buy the coins, just to pump the price. But, isn't that risky? Hypothetically, someone could be selling that many coins at the very same time.