Weyerhaeuser is a major manufacturer of engineered I-joist. Although this is published by Weyerhaeuser, I would anticipate that other manufacturers would agree with this publication. Only time will tell.
The size of the allowable cuts in the top cord are not that large. Most of the time when I find a cut cord, it is to accommodate a PVC trap for a shower or the lines for a toilet. This type of cut is huge, they call them "plunge" cuts, they are common and they do have a specific repair design.
Regardless of this publication, as a home inspector I would still report any cut cord on an engineered I-joist and let the field rep or whoever else make the call.
Same news over on TIJ with a few comments
TJI and the top flange - The Inspector's Journal Forums