I'm not sure why he was initially suggesting that, but I know a thing or two about wspace and fitting ships.
Sig Bloom is a bit of an issue with sleeper missiles, and more importantly - EHP.
VNIs get rather pathetic EHP when shield tanked - with only 4 midslots and no resist bonus, you're in for a bad time.
Armor tanked, they get more EHP than any ishtar could ever hope to while keeping your midslots open for increased speed or application mods.
If you want to shield tank your ships, I suggest gilas, altho they're also rather squishy in terms of EHP, even in full tank fits.
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