Is it OK to leave Low Voltage Control Wiring for Lights hanging mid-air?

[anchorless]

https://drive.google.com/file/d/1sgQtspQyxedrf6YwEL_UPBM2KQXQ0Ytb/view?ts=642f7a51

I found this in a ceiling. Is it ok with the NEC to leave low voltage control wiring hanging and not in an enclosure?

 

[tom baker]

What is an MTW?