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If low magic translates to "magic items are super rare, fighting everything in the Bestiaries, casters are allowed for play" the Automatic system by itself isn't enough to balance a party of casters with a party of non-casters. If low magic translates to "magic items are super rare, predominantly non-flying humanoid enemies, no spellcasters allowed" then the Automatic System can probably pull it off, though you'll be spending a lot of time resting and healing between fights. The Automatic System makes low magic/no-magic campaigns easier to run but it won't necessarily do all the work for you.
In this case, the Skill Unlock Heal would help mitigate the Healing Problem a bit. But i guess this sysmtem work a lot in a ambient where the players don´t wish to keep buying and upgrading their itens so much.