This may or may not be true; I simply don't know. But everything I have come across on the delta variant until now has been that because it is a "variant", it is, like every other "variant", weaker than the original.
That’s because you don’t read AM New York or the New York Times. I refer you to yesterday’s Times. A special little one-sentence paragraph on the continuation page.
The sickness caused by the delta is probably more severe. It was in the leaked document from the CDC.