You're right, we should expect much more for a 7th rounder that may or may not be on our Practice Squad by the time of the bye.
People seem to forget that the Pats have had success with guys like Austin... Malcolm Butler comes to mind.
Also, for some perspective:
Jonathan Jones had a 4.25 shuttle and a 10'3 Broad jump and a 7.25 3-cone
Malcolm Butler had a 4.27 shuttle and a 10'3 Broad jump and a 7.20 3-cone
Jack Jones had a 10'04 Broad jump.
Ellis Hobbs had a 4.54 - 40
Logan Ryan had a 4.56 - 40 but just a 9'8 broad and a 32.5" vertical.
Cre'Von LeBlanc had a 4.67-40, 9'06 Broad jump, a 34" vertical, a 4.21 shuttle, and a 6.95 3-cone.
People should keep in mind that Austin is a legit 6'1. So, he's 2-4 inches taller than these guys as well.
Not saying that Austin will amount to anything, but he's got height and measurables that are similar to other players on the team who have had success.. So let's see how he plays out. He could be nothing or he could be the next exciting DB find ala Jon Jones.