Nope.
First, BCBS of Texas is actually part of Health Care Service Corporation (HCSC), a Mutual Legal Reserve Company, that conducts business as Blue Cross and Blue Shield of Illinois/Texas/New Mexico/Oklahoma/Montana where it provides health insurance coverage to over 14 million members. So when HCSC says BCBS of Texas lost money, it seems it was partly covered by the other states it operates within, given that in the 2015 AM Best credit rating report it lists the 2014 net revenue loss of the company, HCSC, as $281M.
Second, while true ACA has cost them money, it's not the only place this BCBS has had expenses exceed revenues.......from AM Best:
http://www.hcsc.com/pdf/AM_Best_report.pdf
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And as of 2014, the company's capital and surplus was its second highest amount since 2010, with 2013 being the highest. In 2010, it had capital and surplus of $7.763B. In 2013, it held $10.271B in capital and surplus; in 2014 that figure decreased to $9.942B--which was still higher than 2012's figure of $9.553B.