Based on the science appendix it seems like the inclusion of a "low carb diet" is more toward disease treatment and not health promotion. This would be antithetical to the DGA in years past and is kind of useless. The appendix itself acknowledges that the long term effects of a "low carb diet" are muted in the long term, which is probably why you would never hear it hawked by a nutrition professional as a healthy eating pattern.

The restrictions on SNAP are insidious because SNAP is supposed to enable one to live a normal life -- and that includes occasionally buying things that are not "healthy" in a bubble. The mantra that many health professionals will use is "there are no unhealthy foods, only unhealthy diets". Combine all that background with traditional stigma associated with SNAP/food stamp benefits and a picture starts to emerge of why policy was to embrace more foods and how this administration is often called the "administration of harm".