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You seem to misunderstand the nature of the threat and why it doesn't likely apply to Litecoin.

Bitcoin has a historic set of whales who want to maintain the immutability of Satoshi’s (aka TRB) protocol (version 0.5.3). Thus they are likely to support a theft of SegWit P2SH transactions. It is not a bug in SegWit, but a protocol violation because the historic Bitcoin didn’t have P2SH.

Whereas, Litecoin needs an identity distinct from Bitcoin in order to survive, so it is likely that the whales of Litecoin will not support stealing SegWit transactions and reverting to the protocol that did not have P2SH.

The amount of $1M would not be any where near enough to fight the whales of Litecoin.

Thanks for your comment thus giving me the opportunity to respond to misunderstandings that other readers may share with you. It helps.