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I just used vgmcheck to test it: https://www.smspower.org/forums/12009-VgmcheckExtractLoopAndTimeInformationFromV...

I took a look at both "Actraiser - Fillmore.vgm" (from SGDK examples) and "golf.vgm" (from "free-vgms") and those were the results:

D:\Pessoal\Util\vgmcheck-2.0>vgmcheck "Actraiser - Fillmore.vgm" 
--Raw VGM information-- 
Total samples: 2275559 
Total time in mm:ss: 0:51.60 
Loop start: 17639 
Loop start in mm:ss: 0:00.40 
Loop time: 2257920 
Loop time in mm:ss: 0:51.20  
--Usage in SSBB-- (.brstm conversion) 
New loop start: 28672 
New loop end: 2286592  
D:\Pessoal\Util\vgmcheck-2.0>vgmcheck golf.vgm 
--Raw VGM information-- 
Total samples: 1693440 
Total time in mm:ss: 0:38.40 
Loop start: 1693440 
Loop start in mm:ss: 0:38.40 
Loop time: 0 Loop time in mm:ss: 0:00.00  
--Usage in SSBB-- (.brstm conversion) 
New loop start: 1705984 
New loop end: 1705984

It seems that "Actraiser - Fillmore.vgm" has a loop set up on it, while "golf.vgm" does not have a loop. (it's loop time is zero)

It looks like in order to use "golf.vgm" in a loop, it will be necessary to edit it in order to explicitly define loop ponts on it; please see: https://vgmrips.net/wiki/Manual_looping_tutorial