Since you are unable to get into hekate and backup the current nand, yes you will most likely need to swap it out with a working nand IC then the mod chip 'should' be able to get you into hekate and from there you'll need to follow an unbrick guide using a set of donor prodkeys etc, i've never done it on an oled so I can't say for certain that it will work.
Note that if you do manage to unbrick it the switch will have a blank serial number and will never be able to be used on the nintendo eshop or any game that uses nintendo servers for multiplayer