Looks very man to me, but I'll let someone smarter than me about defenses analyze it. Harris was not ready to cover the TE and it looks like Howden came down and blew up Lattimore following his guy. The corners looked like they were doing their jobs, but there was no plan for the guy who had been gashing them all day. It seriously reminds me of when Vernon Davis was running through our defense.
It's hard to tell on the TV shot, but it looked like man with a single high safety. Still a risky call but not a total sell out. But, if it really was single high then I do think it was too risky. I thought there was Cover 2 over the top when I looked at the play in real time.