And the current sytem of democratic election in political theory would be described as representative democracy as opposed to delegated so not sure what you are trying to say. So my MP and indeed my MSP (that's a Member of the Scottish Parliament) are democratically elected representatives.
You seemed to be arguing for a second chamber that is chosen rather than elected, so I suggest here your elision of a representative and a set of people who are representative of a demographic was an easy error to make. However, it was misrepresentative of HH's position.
I'm not arguing for anything - but the earlier discussion was largely about disproportionate over representation of leaders of one religion in the HoLs, with Vlad suggesting a better balance whereby membership of the HoLs was managed to make it more representative (in demographic terms) of a range of 'world views' (his term not mine).
All I was doing was pointing out that we may wish for the second chamber to be representative of the wider population (demographically) - we may also wish the second chamber to be democratically elected, but those two laudable wishes might not be compatible.
So if we want a second change to look like the make up of the country, I suspect that will only be achieved via an appointed process. If we want it to be democratic we need to recognise that we get what the voters decide, whether that overall make up looks anything like the country demographically or not.
Of course at the moment we have the worst of both worlds - a second chamber massively unrepresentative demographically, but also not elected.
And by the way I do know what an MSP is - and yes your MSPs are democratically representative, but the make up of the Scottish Parliament is not demographically representative of the Scottish population (not having a go at the Scottish Parliament specifically, I suspect it is more demographically representative of the wider population than Westminster, but that's not saying much).
So for example only just under 35% of MSPs are women, yet they make up over 50% of the Scottish population. Just 2 MSPs (1.5%) are from ethnic minorities, yet the ethnic minority population in Scotland is over 4%. I suspect there are other examples on age, disability, perhaps sexuality, although not as easy to get the information.