I've yet to see any statistical evidence that this is true. Looking at Kenpom adjT, it seems that slower paced teams have more regular season success then fast paced teams though at least over the last 3 years.
In 2019, of the 50 slowest paced teams 14 made the NCAA tournament, of the 50 fastest paced 8 made the NCAA tournament. 2 of the 50 slowest paced teams made the final four, 0 of the 50 fastest paced made the final four (fastest paced team to make final four was #152).
In 2018, 11 of the 50 slowest paced teams made the NCAA tournament and 13 of the 50 fastest paced teams made the NCAA tournament, 2 of the 50 slowest and 0 of the 50 fastest made the final four (fastest paced final four team was #144).
2017, 13 of the 50 slowest paced teams and 7 of the 50 fastest paced teams made the NCAA tournament. 0 of the 50 slowest paced and 1 of the 50 fastest paced made the final four (slowest was #234).
Edit in 2016 and 2015, 11 of the 50 slowest teams made the NCAA tournament. 7 (2016) and 9 (2015) of the 50 fastest made the NCAA tournament. Assuming my math is right, a random sample of 50 teams would expect 9.4 to go to the NCAA tournament. the 50 slowest teams have been better than random each of the last 5 years (not sure if it is enough to be statistically significant though - I'd guess not), the 50 fastest teams have done better than random only once in the last 5 years.