There’s a small typo in there, it should be --set-blank-from-lpm-on-timeout, but either way that parameter doesn’t work on the Xperia 10 II. The LPM screen is only visible for about a second at most, regardless of how seconds the abovementioned parameter is set to.
And one more thing: the Xperia 10 II seems to suffer from the same proximity sensor issues as the Xperia 10 and Xperia XA2 (and occasionally the Xperia X), which means you will only occasionally get the LPM screen to show up when you take the device out of your pocket or wave your hand in front of it. Usually it just stays black and you have to use the power button or the fingerprint sensor (which is also the power button) to turn on the screen.