yup, electrolysis happens in a cooling system. different elements react together and create a small voltage that travels through the coolant.
here is a little article that could explain it better maybe. no personal thoughts or heresay then. just the facts. lots of owners will simply test the coolant and say, yup it's good. no worries. it's a good idea to put a sticky or whatever on the overflow reservoir to say when the coolant was changed, block drains opened, system flushed and then refilled with fresh coolant. 5 years is a max for me, with the longlife coolant.
https://www.freeasestudyguides.com/electrolysis.html