Chains and other forms off accommodating resistance can be used for more then just speed work. The most important thing is stressing movement patterns and chasing the adaptation, not necessarily the specific exercise you chose.
In this case the instability of the chains add a shoulder stability component that stresses the rotator cuff in a way that regular bench press won’t. Plus it’s a nice change a pace and challenge for athletes.
Shown is 100 w/ 32lbs of chains.