Ummmmmm...not so much
I think he means under the intake manifold, which it is. (go pop your hood)
I've only ever heard of one person saying he was able to change the thermostat without removing the intake manifold, & he said it was such an undertaking that he would have pulled the intake & all the peripheral what-not, were he to do it again.
Also, that's the only way to be sure that all the O-rings etc are in place & properly sealed.
Since a pretty good percentage of 6VE1's prolly have their orig heater hoses, O-rings & intake gaskets intact, it's prolly worth pulling the intake....
Suzee, that rad is a thing of beauty....
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