100% this!
Of course it is taxable. If there was no withholding you report no withholding.
Lets go back to the ABCs of CRDs, ANY DISTRIBUTION (with a few exceptions like corrective distributions) can be a CRD. The 1099-R reports the transaction. The tax treatment of the distribution will be determined based on the taxpayer's filing of Form 8915-E. You can have a CRD from the plan with no withholding, but unless the taxpayer makes certain elections and files Form 8915-E, it is taxed like any other distribution.
BTW, marking it with code 2 on the 1099-R will mean absolutely nothing unless the taxpayer also files Form 8915-E. And if they do file Form 8915-E, it doesn't matter if the 1099-R is coded as a 1 or a 2.
Finally, imagine the following scenario:
Taxpayer is a participant in two plans, and takes a $100,000 CRD with no withholding from each plan. Both plans have followed the rules, and will need to report the distributions accurately. Taxpayer can only treat $100,000 as CRD for preferential tax treatment, and treatment that treatment is entirely up to taxpayer. Why in the world would either plan report anything other than what happened?