The Luohan Quan from Zhu Tian Xi looks pretty good, I don't think it was added, all the forms have Poetic repetition as though they should be done together, I think it is just another Luohan Quan.

Unfortunately Luohan Quan gets much more complicated.

There is also TieBiTongLuohan (Iron arm bronze luohan) from an extinct lineage that still has a few forms.

Xiao Luohan has several roads. Da Luohan has several (I can see commonality in ZhuTianxis later forms, they have the ChangMei posture but do it in XuBu, as does ShiYongWen, I think his Erlu may be the same). Then there are various Jingang Luohan quan and other ones. Then the one you mentioned (I don't know where from)

Its too complicated for me to be honest.

Also it is common for one teacher to pass different versions of the same form. I have so many Xiao Hong Quans, which do I teach? What I taught 5 years ago is not the same as what I teach now.