Flamestrike
Legend
That's literally what obscured means.
I see his argument.
But Crawford has repeatedly said "It's a DMs call depending on the particular circumstances." There is no "right" on this one.
Look at the example I posted above. Iry asserts you can walk past a creature while under direct observation in dim light and remain hidden.
Dim light is darkvision remember.
Hes asserting you can't hide in low light, but you can remain hidden in lowlight, which is not the rules.
A DM can rule otherwise, but thats not the rule.
Being 'unable to be seen clearly' for hiding purposes is situations like being in total cover and peering around the corner of said cover (a sniper for example).
His interpretation is the wrong one.