This is in spite of, or maybe because of, his recent comments where he expressed a desire that members of the Orange Order would be allowed to attend The Mass without the threat of discipline.
Rev Gibson when questioned, in an interview, about his own personal opinion of the rule stated that he would like to see the rule go.
His justification for doing so is that he believes his faith is strong enough to be permitted to attend the Mass.
The Sacred Congregation of Rites of the Roman Catholic Church issued instructions defining what it was to participate in the Mass. It is known as 'De music sacra', which distinguished several qualities of participation. The document states [emphasis mine]:
The Mass of its nature requires that all those present participate in it, in the fashion proper to each.
This participation must primarily be interior (i.e., union with Christ the Priest; offering with and through Him).
But the participation of those present becomes fuller (plenior) if to internal attention is joined external participation, expressed, that is to say, by external actions such as the position of the body (genuflecting, standing, sitting), ceremonial gestures, or, in particular, the responses, prayers and singing . . .
It is this harmonious form of participation that is referred to in pontifical documents when they speak of active participation (participatio actuosa), the principal example of which is found in the celebrating priest and his ministers who, with due interior devotion and exact observance of the rubrics and ceremonies, minister at the altar.
Perfect participatio actuosa of the faithful, finally, is obtained when there is added sacramental participation (by communion).
Deliberate participatio actuosa of the faithful is not possible without their adequate instruction.