X is a high paced team, with about the 20th highest pace in the country. Teams that play at a higher pace than Xavier from the data I've seen that UConn has played are:
Alabama (1) 82-67
Buffalo (6) 84-64
LIU (12) 114-61
In addition UConn has played three other teams with a higher pace than UConn:
Georgetown (86) 84-73
Florida (98) 75-54
Stonehill (102) 85-54
Xavier really does try for quick hitting plays and goes for a lot of transition, and secondary breaks. They pass the ball a lot, like UConn, but don't have near the off-ball action UConn has. Assists seem a lot more predicated on fast breaks, PNRs/PNPs, and drive and kicks/dump offs
The two games I have seen them play they gave up a lot of open shots. Which shows in their 3PT% defense (37.4%, 326th worst in the country), they make up for that by shooting an absurd 40.8% (3rd in the country) from three. Not to mention 47% from two, again bested by their 55%.
Where Nova was a contest of UConn's three point defense in terms of attempts, this seems like it might be more focused on Xaviers three point shooting percentage vs UConn's three point shooting percentage defense (26.5%). Xavier doesn't really take a lot of threes, they just take good ones and make them.