he refers to an old concept that had flaws where an early version of lightning was described with concepts that used segwit (before segwit was even activated),
which after testing had flaws and functional problems.
(these were the olden days of 'revoke codes and penalties and such)
(these were the olden days before msats)
this is why latest lightning 'payment channels' dont use the actual CLTV as the active iou(payments), but are now using HTLC as the active IOU payment channels and just use CLTV as the setup/close session ramps in and out.
even these setup/close sesion ramps in and out of LN are being phased out with new concepts of factories. where by individual users never hold a CLTV. instead a factory(main node) manages a CLTV (from a blockchain funded collateral) to then pass out a HTLC to users(lite wallets). or simply hands out HTLC to users if collateral comes from other sources like coinbase balance