That's fine as long as we have both a canonical version written in Scheme and good "translations" to other languages---including "blub". Good translations should not diminish the value of the canonical SICP. It can be argued that this particular translation is not good; I guess not, as SICP JS's version of metacircular interpreter does interpret (a subset of) JavaScript! The cost is of course this complex definition [1] of which language metacircular interpreter is written in and implements.

[1] https://sicp.comp.nus.edu.sg/source/source_4.pdf