Thanks Tom. You correctly spotted that the tweet contained no science. A video of a lava flow and an unsupported claim of a unspecified amount of "billions of tonnes of CO2".

And you're correct to allude to money. These denialist claims are funded by the fossil fuel industry, the most profitable on earth, and we should follow the money when reading claims like this.

The science is it depends on how much and what kind of volcanic activity you get in a year, but a year's volcanic activity can emit a similar amount of CO2 as up to 5 (count them, 5) days of human emissions.

https://www.science.org/content/article/scienceshot-volcano-co2-emissions-no-match-human-activity

I don't want to tell you how to do you job, but you should make up something to explain why volcanoes have increased over the past century, if you want to get people to think that the increased co2 is due to volcanoes. Assuming you're targeting people who don't know that human emissions are 2 orders of magnitude greater.