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No, GW is really present, certainly not a hoax.

But (dramatic pause) GW is only 1/2 of one degree C over the past 35 years, as measured from a very low point at 1972-73 - Hansen's reference point when he began writing about the comming Ice Age due to airborne particle shielding in the upper atmosphere. Global (particle shielded) cooling got another (politicized) push when it was used as the cause of "nuclear winter" against RR in the mid-80's.

Since then, AGW (not AG Cooling) has gotten attention & funding.

AGW (man-caused GW) is a very different matter, and the above article points at an possible relationship between meteor/meteorite impact and solar irradiance/reflection.

(Personally, I disagree that even a small, local impact event would affect global climates- and the TG impact wasn't very large - even compared to a nuclear blast it was not much more than a "big H-Bomb" exploded well above the surface. Little dust, little fallout. A short (3 month - 8 month) effect? Probable. Longer time period, even through the century? Doesn't seem reasonable. Modern much, much larger volcanoes spewing tens of thousand times more dust and particles much higher in the air create measureable effects that go away far faster than that.)

No, cosmic ray shielding changes (through their effect on cloud cover and hence surface absorbtion AND surface reflection/re-reflection) does track with global temps.

The current GW increase corresponds closely with solar cycles as they affect magnetic shielding (in this the author is correct!) - but NOT CO2 levels - and the current increase in temps relates strongly with the significant decrease in the earth's background magnetic field, and the north magnetic pole increasingly rapid movement across away from Canada towards the Artic Ocean & Siberia.

The TG event may have either interrupted or amplified the on-going natural cycle of the sunspots and cosmic ray incidence levels, but the event itself?

Perhaps a little bit: certainly the earth's magnetic shielding was significantly disrupted for a measureable, significant amount of time. But not for the whole century.