JTBC Anchor's Comment: How is he any different from the establishment he criticized?

Having emphasized minor parties and youth politics, what he rejected most was the 'establishment.'
[Yong Hye-in/Member of the Basic Income Party (January 25, 2024): Please strongly rebuke the establishment parties that are obsessed with protecting their interests without any principles or direction.]
Despite criticisms that 're-election through proportional representation' is a privilege, and controversies arising from being elected via a 'satellite party,' the justification of 'breaking the establishment' has sustained him.
An opportunity to enter office has arrived.
However, he says he intends to maintain his 'position as a proportional representation lawmaker.'
He claimed it was an inevitable choice to prevent his party from becoming an outsider party.
Proportional representation is different from district lawmakers who represent a specific region.
It is a system that provides various talents and experts with the opportunity to focus on legislative activities.
It also serves as a 'gateway opportunity' for political newcomers.
Therefore, if a proportional representative moves to another public office, it is in accordance with the purpose of the system to pass that seat to the next candidate to circulate opportunities.
In terms of custom, most have done so.
If he intends to maintain the opportunity he already has while also seizing a new one—and if that means the opportunity does not pass to someone else—how is he any different from the 'establishment politics' he has criticized so much...
He seems to need an explanation.