Exactly the same conclusion I reached time ago, too bad that my A600 mobo was already entirely borked by experimenting by the time I thought of it
It should be noted that capacitors in that area seem to be very prone to leaking, and the electrolytes will interfere with the normal booting of the machine, as you found out.
Finally having this info here on this forum (reachable from Google too, hopefully) will help someone else in resurrecting his Amiga 600!
Great job, kipper