I've never heard anyone mention an A meddling with Soberlink clarity. I've heard - oh it won't work etc, but flat tire air?
As for his drinking being a negative to your Son, if he hasn't figured that out by now (ie: he is so far in to his addiction he won't see it), there is nothing and no one that will convince him.
So he deceives you, putting your Son's safety aside, refuses to help you out (yes, even though your boundary should be rock solid, your working is helpful to your Son and that should always be taken in to consideration)
The pictures of him blowing in to SL are a waste of time and could be fudged, so it's zero proof. I still wouldn't allow unsupervised visits until such time as he has a record of consistent sobriety during visits (he can blow in to that soberlink with you standing right there). I would just be sure to have distance, ie if he is coming to your place, leave the room once he arrives. His shouldn't be getting to play happy families at your expense.
At this point he cannot be trusted at all.