They fraudsters use this argument a lot, it just shows how scientific illiterate they really are.
It doesn't matter if the sun, if the sun is slightly lower or slightly higher from one month or year vs another because the sun in the last 50 years of the 20th century was still higher than it's been for a 1000 years.
The sun doesn't have to keep getting hotter & hotter to continue to warm the earth. We see this yearly with the seasons, using their logic, the tilt of the earth can't be the cause of the seasons because the sun peaks in June and then declines in July and August but even with a weaker sun July and August still are hotter (and sometimes by a lot)than June .
July and August are hotter than June because 1) The Sun is still high enough to cause warming and 2) The Earth has buffers (i.e. Oceans as heat sinks) to rapid instantaneous changes and 3) it's adding warmth from the previous months
The same with the warming in the last half of the 20th century, sure the solar cycle in the last part of the century was slightly less than the one in the 50s or 80s, but it was still extremely strong and it was adding heat to the previous extremely strong cycles.
That's why their models are flawed, they assume all changes to the sun will have an immediate drastic effect on the earth. It takes time.
And likewise, one weak cycle isn't going to immediately throw us into an ice age, pretty much for the same reason it's not as cold and snowy in October as it is February even though the sun is the same strength.
But yes, the two cycles of the start 21st century haven't been as strong as the two at the end of the 20th which probably explains why warming has stopped.
hah! you are a hemispherist! Tell us what months are summer in the southern hemisphere, eh?