“Thanks for clarifying – seems that the question is – is the majority of the anti-eruv yidden consider the issue m’duaraisa? seems like there are 2 opinions.”
By definition, you can only build an eruv where the issue of hotzaah would be d’rabbonon. If it’s a reshus harabim m’doraysa, it would be unfit according to everyone. So, the discussion comes down to what makes something a reshus harabim. There are far more than 2 opinions. On the one extreme, there is the “reshusei harabim literally don’t exist” crowd as you can see here. On the other extreme, there are those that reject the 600K definition which would make every single city eruv pasul (I assume this is the “anti-eruv” crowd people keep alluding to).
L’maaseh you just have to go by what your mesora/rav says on the issue, and you should know that there are some extremely far-out, non-mainstream opinions being shared on this forum and elsewhere on the internet.