I have no idea whether the RB sounds identical to the Traynor, and no investment either way. BUT, there is a huge leap between "listen to any Shellac song" and "he used the RB on some live tours".
I also am deeply, extremely skeptical of any brand's claim to have made an exact copy of a famous amp/circuit. Most often they do not use the same components, and they make several changes to accommodate the pedal format (size, power supply, input impedance, etc.).
That is no comment on THIS SPECIFIC INSTANCE because, for all I know, the pedal may be a perfect sonic recreation of the amp. But simply repeating a brand's claim about their accurate reproduction is not the logical defense one might have been going for.