Nope, it only blocks connections coming into the WAN sourced from a private IP address:
# block anything from private networks on interfaces with the option set block in log quick on $BT from 10.0.0.0/8 to any ridentifier 12006 label "Block private networks from BT block 10/8" block in log quick on $BT from 127.0.0.0/8 to any ridentifier 12007 label "Block private networks from BT block 127/8" block in log quick on $BT from 172.16.0.0/12 to any ridentifier 12008 label "Block private networks from BT block 172.16/12" block in log quick on $BT from 192.168.0.0/16 to any ridentifier 12009 label "Block private networks from BT block 192.168/16"
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