To preface, I am not an expert.
If you activate a key from GMG and it activates as sub 675100, then it is indeed region free! SteamDB is fully automated - so no mistakes there. You can be sure in this case.
However, if you have not activated a key from GMG yourself and don't know which sub it is, then it is possible that SteamDB does not know/has not seen the correct sub for it yet (which may be region locked!).
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when you see a price on steam store (for that region) you can tell it's not region locked (for that region), also the region locks appear with red boxes like this https://steamdb.info/sub/839751/
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