I agree that there is truth in lies. And I'll add that often times lies are lies by omission - and there's sure a lot of omitting in this case.
But I don't believe Lonzie died in a hot car. For one thing, hot as Florida is in the summer it would be unusual for a car's interior to heat up that much during the evening and night hours. A big factor in the inside temperature is direct sunlight on the car - that's what turns it into an oven.
But mostly I don't believe it because I've yet to see a hot car death covered up as a missing child incident. The majority of cases I've followed get written off as "a tragic accident" and the caregiver receives little punishment. In cases where charges are pursued they're usually in the form of neglect or endangerment. There have been a few where murder charges are filed but even then caregivers are usually found not guilty.
Of course there are exceptions - I'm waiting for Ross Harris to go to trial for little Cooper's death but even in that case he didn't make Cooper disappear. But if Ebron was going to gamble on what charges he'd face in a hot car death versus say, beating Lonzie to death, the odds would be in his favor in terms of charges if he had just called 911.