Keyvan and the passage are talking about conditions when others (like the Iranian government does still today) try to force us to give up our Faith.
A letter on behalf of Shoghi Effendi stated:
"The Beloved Guardian has directed me to write you concerning information which he has just received of your having indicated in your application for permanent residence in ..., that you were Protestants--and you did not indicate in any way that you were Bahá'ís.
"The Guardian has instructed me to inform you that he is shocked and surprised to receive this news, and this action meets with his disapproval. He said that if advance information had been given that such action must not be taken under any circumstances; then there would be only one thing he could do and that would be removal of voting rights.
"Certainly such action in the future would result in immediate removal of voting rights.
"In Persia, even during the period of persecution, when life was in danger, and complete freedom offered to those who indicated they were Muslims and not Bahá'ís, the Guardian not only deprived anyone who did not openly declare his Faith of his voting rights, but even indicated they were Covenant breakers.
"Thus you will see that it is completely inconsistent for a Bahá'í under any circumstances whatsoever, to indicate they are anything but a Bahá'í, regardless of what the result may be."
(From a letter written on behalf of Shoghi Effendi to two believers, April 30, 1957)
So, the Baha'i position on dissimulation is different from Islam, in that it is not permitted even in times of danger.
Of course, even Covenant-breakers can be reinstated if they seek forgiveness from the Center of the Cause, now the Universal House of Justice (though I don't know that the Universal House of Justice still applies this principle as in the time of Shoghi Effendi).