Anybody disagree with Alex's view that the contingency argument can't result in a desitic god (in his newest video)?

As I understand correctly, the contingency argument is just a cause and effect argument. Everything has a reason for its existence, and at one point, this chain of causal events must come to a halt (leading back to god). In what way could this not warrant a deistic god? I don't understand why Alex thinks it's more likely (if a god exists) that he's active in this universe and holding everything together. Why would there be a need for god to hold everything together? Physics seems to explain everything just fine.