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holding ecash tokens or ark vutxos to start and at the end they are holding ecash tokens or vutxos, not bitcoin.
I think that as long as we recognize the "not bitcoin" part, this is fine, and that's my primary point: if it's not on L1, it's not bitcoin. The nasty thing I will add, and I truly believe this: also not on LN (sorry). This means that settlement can only be on L1 (if you're a purist) and everything other than L1 is at best bitcoin * (1-<risk factor>).
They are using it as a transport layer?
Yes. Between unsettled bitcoin-derivatives.