...
I and most others are persuaded that he was referring to himself i.e. 'I normally wear glasses but wasn't on this occasion'.
...
The statement in Portuguese is "Não usava óculos, nem barbá ou bigode."
Usava is imperfect tense, which covers habitual action (used to), or was ...ing form.
Usar, the infinitive for usava, means to use or wear when applied to glasses, and to have or wear when applied to beard or moustache.
The -ava ending is used for 1st person singular (I), and 3rd person singular (which covers lots but here can only be he).
This leads to 4 alternative translations.
I used not to wear glasses, nor a beard or moustache.
I was not wearing glasses, nor a beard or moustache.
He used not to wear glasses, nor a beard or moustache.
He was not wearing glasses, nor a beard or moustache.
This single sentence definitely cannot change from 1st person at the start to 3rd person after the comma, because of the conjunction nor, which welds the two parts together.
The sentence is embedded in description of Smithman, before and after.
Martin Smith was not describing himself in this sentence. He was continuing his description of Smithman, so the first two options are out.
The 3rd option requires that Martin Smith knew the habitual actions of this man. Clearly he did not, so this option is out.
That leaves "He was not wearing glasses, nor a beard or a moustache", a description of Smithman, as the only translation that fits Martin Smith's statement.
If anyone has used this as supporting evidence re the newspaper links you have provided, that person was in error.