A brief google search suggests he was arrested for being part of Antifa/evidence obstruction?

Edit:

Corruptly Concealing a Document or Record, by transporting a box containing numerous Antifa materials, such as insurrection planning, anti-law enforcement, anti-government, and anti-immigration enforcement documents and propaganda from Sanchez Estrada’s residence to a location in Denton, Texas, intending to conceal the box’s contents and impair its availability for use in a federal grand jury and federal criminal proceeding.

https://www.justice.gov/opa/pr/leader-antifa-cell-members-north-texas-sentenced-100-years-prison-terrorist-attack-ice