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Is there any limits of power or power to mass (or any other) limits for nuclear bombs?

I found this wiki article: Nuclear weapon yield: Yield limits. Is the information provided is correct? If yes, from where this limits come from?

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up vote 3 down vote accepted

The sun and all other stars are in effect thermonuclear bombs. If they get heavier than about 10 times the mas of the sun they eventually blow up as a supernova, so there is a limit to the size but it's a lot larger than anything we will ever build.

In the wikipedia article, the yield limits have to do with deliverability. It's no good having a huge bomb if you can only explode it in the factory where it's made. They're talking about "6 megatons per metric ton" so a 60 megaton bomb would weigh 10 tons. The article gives examples of delivery, with the limit being a 1.3Gt bomb deliverable by an Antonov An-225.

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