Europe has plenty of 'sweet bread' with sugar in similar quantities. I don't begrudge resistance to industrial 'bread products' but this is just a performative headline.
(Edit: receiving down-votes and I'm curious to know what's controversial about the above. Perhaps Subway is advertised differently in your country? Would be interesting to know.)
If they were promoting it as a brioche sandwich, that'd be one thing.
For example, while rye bread might taste sweet, it's not because of added sugar (for example, only certain types of Finnish rye breads have syrup added to them, but most do not). The sweetness comes naturally from the rye when it's processed for enough long time. Just like the sourness.
Yay English.