Yup I have the same one.. I switched to the beastmode kernel, because the others were very laggy.. Under status, it does say LTE.. I personally like this rom, now that I have it almost set the way I want.. My only purpose is to give it to the grandson, but yet he might want the wife's Iphone 8 once it is paid off next month, as she already has a FREE Iphone 10 XS Max, thanks to Sprint screw up..The LTE icon is not displayed in the notification header. The screen shot I posed just above your post displays the kernel I have installed. Having flashed this rom and trying all the kernels provided with the Aroma installer all worked. The issue was poor network connections and mainly stuck on 3g. Flashing the BeastMode r61 Hybrid kernel was the fix.
I am SuperSu rooted and the kernel is permissive. Not sure if The SELinux Switch app will change it to enforcing.