The problem with that chart is that, IMHO, it's not accurate because they roll the 50 yarders in with the 40+ as if they are the same difficulty.
Also, not sure if Hill's numbers include Post-Season since the % don't match up with the stats the NFL has..
Stephen Gostkowski Stats | Pro-Football-Reference.com
Stephen Gostkowski: Career Stats at NFL.com
Regular season (NFL doesn't include Post Season in Career stats on player pages)
2016 - 40-49 = 9/10 50+ = 2/4 11/14 = 78.6%
2017 - 40-49 = 8/11 50+ = 4/4 12/15 = 80%
2018 - 40-49 = 4/6 50+ = 2/5 6/11 = 54% <------ minor concern.
2018 Missed 40+ FGs :
54 yard against JAX
50 yard against BUF
52 yd against TEN
48 yd against MIN
42 yd against MIA
*46 yd against LAR
* - missed in SB.
of the 6 Missed 40+ yd FGs, only the 42 yarder should have been a gimmie, though it was in MIAMI where Gostkowski has had issues since 2011.
Missed FGs in Miami for Gost:
2011 - Missed 48 yd FG
2012 - Missed 49 yd FG
2013 - Missed 48 yd FG
2014 - No Misses
2015 - Missed 46 yd FG
2016 - Missed 52 yd FG
2017 - no misses
2018 - Missed 42 yd FG
2019 - Missed 48 yd FG