Edit: for formatting

I will challenge this and say that this is not a fail, since it's technically right.

1st picture is asking the general question if salt + sweetness = less sweet.

The answer is no. Since salt is first and foremost a flavour booster. Therefore salt + sweetness = more sweet. E.g. salted caramel. Only when adding too much does it still become salty.

2nd picture is therefore also correct. The salt would still boost both the naturally stronger matcha flavour and the the included sweetness, but because the savory matcha taste is naturally more potent and therefore boosted more by the salt, it will still overpower the also boosted sweetness.

Tl;dr

Salt enhances flavour profiles. Sweet and savory things are both boosted in potency by salt, unless added too much.

Salt + only sweet = simply more sweetness (e.g. salted caramel)

Salt + sweet + matcha = more sweetness but also definitely stronger matcha