Of course. After all, anything that comes from the religious elites must be true, right?
You're confusing a fact with an article of climate dogma. The dominant driver of temperature on this planet is the sun, and the dominant greenhouse gas is water vapour. Unless the variations in those can be accounted for you're just acting as a repeater for the cult of warm.
This is why I suggested you need to read the thread.
To repeat: water vapour is of course the chief greenhouse gas in the atmosphere but the point is its level is self-regulating, given a stable temperature, by the balance between evaporation and condensation (rainfall). However when the concentration of other greenhouse gases (CO2, CH4) is increased, that temperature goes UP. This causes the balance point between evaporation and rainfall to shift, yielding a higher equilibrium amount of water vapour in the atmosphere and thereby magnifying the effect. So the role of water vapour is to
greatly amplify the changes induced by these other gases.
As for your graph, the choice of scale and range make it fairly useless to illustrate what we see happening. We are actually concerned with a CO2 range from 280ppm (the level at the end of the c.19th) to about 400-450 for the levels we are at today and will reach soon. When you zoom in to that part of the graph, the increase in absorption from 400-450ppm is indeed less than from 350-400 ppm, but it still at least 50% of it, so still very significant indeed. There is no room for supposing that the impact of further CO2 increases will level off in some way.
Here is a bit more on this issue from the Royal Society:
8. Is there a point at which adding more CO2 will not cause further warming? | Royal Society
Our understanding of the physics by which CO2 affects Earth’s energy balance is confirmed by laboratory measurements, as well as by detailed satellite and surface observations of the emission and absorption of infrared energy by the atmosphere. Greenhouse gases absorb some of the infrared energy that Earth emits in so-called bands of stronger absorption that occur at certain wavelengths. Different gases absorb energy at different wavelengths. CO2 has its strongest heat-trapping band centred at a wavelength of 15 micrometres (millionths of a metre), with wings that spread out a few micrometres on either side. There are also many weaker absorption bands. As CO2 concentrations increase, the absorption at the centre of the strong band is already so intense that it plays little role in causing additional warming. However, more energy is absorbed in the weaker bands and in the wings of the strong band, causing the surface and lower atmosphere to warm further.