Find the corpus here: https://zenodo.org/record/3899040
The paper (https://www.aclweb.org/anthology/2020.acl-main.680/) has all the steps for preprocessing and aligning the tweets. Please cite the paper if you use this corpus for your research.
Please email Shruti Rijhwani (srijhwan@cs.cmu.edu) with any questions about the dataset or if you have trouble with aligning the tweets to the annotations.