1. The concept of "domestic terrorist organization" not a thing under any US law. Further, there exists no such organization in observable reality.
2. "All relevant executive departments and agencies shall utilize all applicable authorities to investigate, disrupt, and dismantle any and all illegal operations" is … nothing, because that's what federal law enforcement is already charged with.
2. Not incoherent. Seems pretty specific: All relevant executive departments and agencies shall utilize all applicable authorities to investigate, disrupt, and dismantle any and all illegal operations — especially those involving terrorist actions — conducted by Antifa or any person claiming to act on behalf of Antifa, or for which Antifa or any person claiming to act on behalf of Antifa provided material support, including necessary investigatory and prosecutorial actions against those who fund such operations.