Yes, it is only the right side that needs that nut removing to move the hub out to get the strut to drop down low enough to remove it.
Now, the general advice is that these nuts can only be used once as they have a large spring tang/clip part underneath that acts as a locking device, or self locking element(device).
Certainly when I replaced the springs on my wife's old 2002 Polo back in 2005/206, that part of the nut broke off when it was being unscrewed - so I could understand why that nut needed to be replaced if removed.
When I replaced the springs on the late 2009
Ibiza earlier this year, when I removed that nut it unscrewed without breaking that locking element - and when comparing the old nut with a new one, it looked like there was not difference, ie the locking element was still intact - but I did replace that nut.
So, take from that what you want, I'm sure that I read about other people just reusing that nut, hopefully only because it was still okay.
Also, the VW Group part number for that nut on a 2002 Polo is still the same as that on a late 2009
Ibiza, though maybe the manufacturer of these nuts has changed/corrected a process?
For my money, if the original parts fitted together well enough on that old 2002 Polo to cause/force that locking part to break when I took it off in 2006,then I think that it was doing its job, ie working as designed - having removed the same design of nut from maybe the same design of hub in a late 2009
Ibiza earlier this year, and finding that the locking part did not break, maybe means that it was not really doing its job?