The biggest known fuel-air explosive bomb developed by the US, the GBU-43/B has a 11 ton yield, and weighs 18.000 lbs.
The Russian FOAB ( that's for Father Of All Bombs) has a yield of 44 tons, but I can't find the weight.
This Chinese weapon has a yield at least 5,000 times greater, and it's light enough to be a ballistic rocket wathead!!! Doesn't sound feasible.