Wow that picture thing blew up WAY more than I thought it would. Thank god I muted my notifications before my work orientation...
Despite finding that house, I don't believe that Writer's Block is the Blumhouse mashup. I have advocated against that and will continue to say no Writer's Block is insidious, John's 'mad science project' is Blumhouse. However it was a neat little find because I'm 99% positive that that's what the facade in the JP Queue is based on. Here's my most likely scenario...
Maybe while shooting this episode, Jason saw the house and liked the look of it and decided he could revisit it for a future film, that film being the upcoming Insidious ch. 4
Just because Jason Blum was on the episode and the house looks exactly like the facade in the JP queue does not mean that that maze is Blumhouse