You have to have a NRA Instructor Certification or TECLEOSE certification or some other nationally recognized certification in order to get a new CHL Instructor certification. As for renewal, you have to fill out the new CHL-90, correct, which requires proof of one of these certifications. Ergo, you need to have one of these certifications. They have always been a requirement. DPS is choosing to enforce the letter of the law now. There have been a couple of other threads here on the forum about this situation.
Depending on how long ago you let your NRA instructor certification expire, you may have to take the BIT again as well.
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TBM