Unfortunately I cannot find the confirmation that a storage system can present to vSphere a LUN bigger than 16TB ...
There are indeed still storage system with a 16TB maximum LUN size. I assume that Netapp's 16TB maximum is due to a file system limitations on which they store the LUNs.
Anyway, the storage vendors usually have the max. LUN size for supported operating systems in their documentation, and even less expensive systems support LUN sizes with 256TB, or more.
André