I was very skeptical of his involvement because I have seen similar situations at work. When I was a consultant I often worked on emergency situations where you had to bring systems back online quickly. Sometimes the CEO would come in and say "You can get whatever you want" and suddenly you had all these important people who didn't know the situation ask questions and give suggestions. Now you had the problem at hand and you had to baby these people in addition. Once the problem was solved the CEO and his people took credit for the fix and went away despite in reality only causing problems.

There was simply no time for the people on location to look at Musk's stuff and testing it. It would have been a big distraction from the work at hand.

So far I would rate his involvement as pure PR stunt. However, if he kept working on this now that the crisis is over and worked with experts on something viable for the next rescue he would be really helpful. I don't know if that's happening and to be honest I have my doubts.