Reading between the lines, it appears that infofront
may adhere to the following hypothesis:
Once enough value gets bound up in segwit addresses, it becomes an irresistible honeypot. For while those addresses hold value under segwit rules, under the previous protocol rules, they are 'anyonecanspend' transactions. To the extent that the miners collude to roll back the chain, they are free to claim these 'anyonecanspend' TXOUTs for themselves. Every additional UTXO held in a segwit addy is additional incentive for them to behave thusly.
Once done, then the protocol and system would be back to the ersatz immutable 1MB block chain cap.
But hey - we've been over this already.
It's a theory. One which infofront may also
not adhere to.

You laid that out pretty well. I'm not as certain as Shelby or TMSR that it will happen though.
My biggest concern with that theory is that the honeypot will be devalued after it's taken by the miners, which reduces the incentive to take it. OTOH, the segwit coin airdrop they'd get might make up for any devaluation of the 1MB chain caused by miners taking the 'anyonecanspend' transactions. And what do you think?