No. I don't think so. Ross Harris may be emotionally immature and was for sure an unfaithful husband, but there is no evidence whatsoever he is a sociopath, and he would have to be that to see his dead baby's body and to feel nothing and to have to play act to work up an upset, or to imitate what he remembered about someone else's grieving.
Every friend he and Leanne had, and all their church and work acquintances, have said the same thing- Ross loved Cooper. Only LE and the DA have said otherwise, after Cooper's death, with zero evidence to back up that assertion. Zero. As in, none at all.
The best they could come up with is searches they say he did about living a child free life, searches he in fact apparently never did. He never responded to posts on that forum, and the 3 posts he clicked on had nothing whatsoever to do , actually, with children at all, much less living without children, much less killing one's child to be "free."
Absent any evidence whatsoever that Ross did not love Cooper, I think it's a huge stretch, and unfair, to assume Ross felt no grief that day, even if he didn't express it in a way that met approval by LE or others.