That site is closely associated with the Old Calendarists, so I prefer to avoid it, and use other sites to access Patristic works, of which there are many.
Additionally in quoting St. Nicodemus you are missing the point: we should not criticize third parties over their sin, over the splinter in their eye, given the log that is in our own eye. I am more sinful, as far as I am aware, than anyone else alive. I confess this at every divine liturgy by confessing myself to be the chief of sinners.
What St. Nicodemus wrote was one of several guides available for the private counseling of penitents in the sacrament of reconciliation. It is strict by contemporary standards, not as severe as the Penitential Standards of St. John the Faster, which in turn were not as severe at what came before, but these days people are fragile, and one great blessing of Eastern Orthodoxy is that we don’t have to penance everyone who comes for confession, thus we can encourage frequent confession and frequent communion.
Conversely, the confiteor ante communionem is a public confession before the Eucharist, which includes the Troparion from the Vesperal Divine Liturgy of Holy Thursday - one which these days is usually recited congregationally. Insofar as it is a liturgical text, it can be regarded as extremely authoritative. I can’t worry about the sinful acts of various public figures when I should be focused on my own sins.