I believe that is the case. @Bazz99 helped her do it, IIRC, so same as his. There's a part-number / description for that size-down thing somewhere on here.I need to re-res the miracle whip build thread, but seems like she used the aux port and a simple reducer to get to appropriate fuel line size before the heater. Seems like a good option.
That said... it's just not that big of a deal to drop the tank and install the stand-pipe. I can't think of a good reason not to do that. 🤔