Depends on who you ask. I just don't consider it a takedown, since a bigger stronger guy won't be taken down. And might slam you real bad.
IBJJF banned jumping guard for white belts. Here's a video on topic with clips of failed guard pulls and instinctive slams:
Check the comment to the below clip: "My competitor at my first jiu jitsu competition jumped to pull guard and landed on my knee. I ended up with a broken fibula and a torn ACL and LCL."
You don't want that shit happening. A failed guard pull can injure you or your opponent or even both.
So how would a BJJ expert go about it then when faced with a competent thrower and concrete ground? Can he try a guillotine choke standing up?