Taken directly from OPs posted article link:
A US federal judge then concurred with the fraud allegations ... finding that Donziger conducted a “pattern of racketeering activity”
Donziger was made liable for millions of dollars in Chevron’s legal costs and the company was granted seizure of his laptop and cellphone. When he appealed this ... the judge, Lewis Kaplan, hit him with criminal contempt charges, upheld on appeal, that led to his house arrest.
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At no time was this arrest related to the attorney's suit of Chevron. His arrest is due to US Federal anti-racketeering charges brought against him. Those charges were then upheld by a US Federal Judge.
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This article is a soft-pad for a criminal. Stop it.