I believe the stock trigger is heavier, perhaps even twice that figure. But it's a long, smooth pull so it's tough to judge and my finger hasn't been calibrated lately.
4# is lighter than I'd be comfortable with on a gun with no safety. The long, double action revolver like pull is the safety feature for me on the TCP. But I don't claim to represent the mainstream, and the LCP2 is exhibit A. I wouldn't own one of those if you gave it to me.