DTY/LKS - while I am in full agreement with your sentiments and advice to 'check' if in doubt, it looks as if SRG and you are in disagreement. From the link given above (p4)
Similarly, if the original clearance included a restriction, e.g. ‘cross XYZ FL180 or below' then the issue of a revised clearance automatically cancels the earlier restriction, unless it is reiterated with the revised clearance.
Maybe you need to raise this issue formally? If I recall all the previous threads correctly on this they all agreed with the SRG.