I don't think the poster implied that he was exempt from wage garnishment simply because he had changed jobs. He wrote:

"I have heard that the landlord is unable to collect via garnishment in NC..." So he correctly pointed out that his NC residency makes a difference.

Then he wrote "...unless they issue the garnishment to the employer I worked for in Missouri AND I still work for them." So he thinks there may be an exception to the residency rule, but only if the debtor works for an out of state employer, which he doesn't.

I don't know how you could have intelligently interpreted the poster to be broadly stating that a debtor is free from garnishment if he switches a jobs.