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I've checked some other brands online and it makes me wonder if it's due to a local ketchup law or simply a marketing thing. Store brand 156 per 100, organic store brand 120 per 100, competing brand 140 per 100, a different competing brand 180 per 100, Heinz classic 148 per 100, Heinz organic 180 per 100. They all mention it.

Counting solids doesn't make sense unless you're evaluating ketchup powder. Ketchup itself is mostly water.

By that reasoning if you sold someone a tomato, that's 10g of tomato solids for each 200g of tomato, and actual tomatoes need to be labelled as "contains 5% tomato".

Not really, the tomato is 5% tomato solids and 100% tomato. The ketchup is some percentage solids and another percentage vinegar, so unless they use tomato vinegar..

maybe it's not that much, but it's more than an actual tomato has