I had to read this post by Senator Shafer more than once to understand exactly what he was saying.
If Sonny line item vetoes an appropriation because he does not like the language inserted by the legislature in the line item, the money returns to the general treasury. Sonny is taking the oh-so-bold leap to then say that, instead of vetoing the line item, he can ignore the instructional language of the legislature and spend it any way he wants, so long as it has a related purpose to what the legislature wanted.
If Sonny does not want to spend the way the legislators wanted him to, he can veto and the money is not spent that way. That is what the Constitution contemplates. But then to go the step further and say the Governor can then decide when and where to spend the money, so long as the purpose is related to the legislature’s purpose (the one he rejected and vetoed), seems to be an unconstitutional act of taking from the legislature the power of the purse.
In Sonny’s case, he’s trying to have it both ways — “veto” how the legislature allocated the money and then spend the money as he sees fit.