Crr of 0.004 is actually extremely conservative WRT estimating CdA. Believable on good surfaces with the best tires, otherwise, Crr is higher and CdA is lower.
0.004 is the lowest I have ever measured. That was with Vittoria Speed tubeless on one year old decent pavement. IIRC, I got 0.0042 with GP5000 and latex on the same road. I typically get 0.005 with the GP5000 and latex tubes on more typical roads where I live.