Thanks for checking, the correct name is Halobacteriota
Ha.lo.bac.te.ri.o’ta. N.L. neut. n. Halobacterium, type genus of the phylum; -ota, ending to denote a phylum; N.L. pl. neut. n. Halobacteriota, the Halobacterium phylum
I would also check with SILVA to see why they use ‘Halobacterota’. If it’s an error, they will probably be happy to learn about it and correct it in the next version of their DB.