You fell for the clickbait. When comparin organisms outside mammals by biomass the stydy says.

The sum of the biomass across all taxa on Earth is ≈550 Gt C, of which ≈80% (≈450 Gt C; SI Appendix, Table S2) are plants, dominated by land plants (embryophytes). The second major biomass component is bacteria (≈70 Gt C; SI Appendix, Tables S3–S7), constituting ≈15% of the global biomass. Other groups, in descending order, are fungi, archaea, protists, animals, and viruses, which together account for the remaining <10%.

Today, the biomass of humans (≈0.06 Gt C; SI Appendix, Table S9) and the biomass of livestock (≈0.1 Gt C, dominated by cattle and pigs; SI Appendix, Table S10) far surpass that of wild mammals, which has a mass of ≈0.007 Gt

We dominate the mammals space but we are barely visible in front of the plants, bacterias and fungi on the planet earth.