Meanwhile, even the most basic of prosumer ROVs (remotely-operated underwater vehicles) like the BlueROV2 costs almost $3000[1], that that's without including the fancy computer vision tech and/or acoustics features that they're describing in here, which probably won't even be able to take advantage of the economies of scale for spare parts like thrusters, etc. That doesn't take into account the eventual maintenance costs, replacement, etc.
There's some places where marine robotics offer benefits for replacing humans--deep sea diving, oil rigs, etc. But that only works because the cost of training and employing humans is so much higher, there's support equipment costs anyway, and the risk involved warrants it. I don't see any of those factors here making this likely.
[0] https://www.redcross.org/take-a-class/lifeguarding/lifeguard...