My favourite thing about that table is that it puts to rest, spectacularly, the argument that summoner is bad post flash nerf. The damage is still very good, the tank is still solid, and the class is still doing fine in K:D ratios despite a low average level of people using it.
1) The tank is 'okay' sure. Not Defiler, not Mage. But it's okay.
2) Damage done in groups is not an indicator of whether its damage is still 'very good' as you say. Considering we have a) Diabolists negating fire resists, b) Defilers also negating fire resist and c) Sensitivity artificially inflating damage done (not exclusive to summoner, but inflating nonetheless).
---eta: Defilers also negating psy resists for pact damage.
3) KD ratio is literally irrelevant as to whether or not a class is doing fine. By that metric, Engineer would also be fine since it has a higher KDR than Summoner.