Yes, but my point is the statutes of the CNT are ideological, so it's contradictory saying 'you don't need to have any ideology you just need to accept our revolutionary anarchist statutes'. Now maybe the point is members don't need to identify as anarcho-syndicalists, anarchists etc as long as they act like them. That would be internally consistent (and something I'd agree with). Maybe Sevilla are using 'ideology' to mean 'tight party line' rather than 'set of shared assumptions, values and goals', which would tend to the latter reading.
...not to pick on you personally, but you yourself raised a point on an ancient threat and it might be relevant here:
how do you have a a mass, democratic organisation with revolutionary aims if the majority of the membership aren't revolutionaries? (a paradox faced by anarcho-syndicalists too, lest this be taken as an 'attack' on the IWW)
Whether or not the majority of the CNT membership consider themselves anarchists (and I'd assume they do, actually), what's to stop a situation developing where it grows to the point that revolutionaries become the minority? In any case, do non-political members genuinely act like anarchists?
Robot pointed out the background of the Sevilla text very well. What remains is the use of a term "ideological". The fact is that CNT-E is political and ideological organisation when you read the Sevilla text. However, they do not tell you your ideology has to be this or that (anarchist, trockist, democratic, whatever...). So I would say, this is what they mean by the mentioned sentence where they speak about membership and being ideological. No big deal in fact...
And as for the CGT. Every organisation can be exposed to inflitration, be it state or from other political groups. However, it is true that CNT-E probably have better mechanisms to prevent such things. And even more when we are speaking about active militants as was the case of the fascist guy.