I asked him multiple times about it (used chat). Kept saying old ultimate stays as is and if I need 10mbps then it's $122.x It was Alan something.
Call in and ask the rep to search "higher upstream available" in their knowledge base system. You can also see throughout this thread here, there are many individuals who have 10mbps up with the regular ultimate tier. Some of whom, got upgraded quite recently as well.
You can get 10mbps upload with no issues with the SMC with the regular ultimate package. You just can't get The New Ultimate package with the SMC because 4 bonded channels on the downstream can't reliably sustain 150mbps.