Tyvek on Block walls

This was a comment by a Florida Building Official on  waterproofing block walls. 
​"Masonry is by it's nature porous and is not a good vapor barrier. My assumption is that in addition to the Tyvek, some sort of siding, brick or other finished material is planned other than stucco. "   What are your thoughts? ​

You would never put tyvek on a masonry wall.   I have never heard or seen such a thing.   The code does not require a “vapor barrier” on cmu .   Your block either has integral water repellent in combo with an exterior sealant/paint ----- or ------ it is stucco’d in which case the stucco and paint in combo with the cmu becomes the water/vapor barrier  ------ or---------- you put brick on the outside with a roll on barrier  ------ or---------- if you are using direct adhered stone or thin brick you use a product that seals the wall and adheres the stone or thin brick.  
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In all cases,  other than at cracks - which need to be addressed in the design, the wall is water tight and sufficiently vapor tight to keep the interior dry.