Oh sorry OP I just clicked through to the plan you're on about. No, no tethering for the "4G at sub-3G speeds" plans on any network - and even if you could it'd be unbearably slow.
I strongly recommend you get a proper 4G contract if you're going to use anything at all above WhatsApp, email and Pokemon Go.
If you want data only, Vave do a SIM (they piggyback on CSL's network) for truly unlimited 4G for $268/m, purchased 1 month at a time. Go to a "local" shopping mall and ask for a SIM card at any of the tiny phone shops.
For a little less the regular carrers do "unlimited data plans" with a FUP but think you're going to regularly go over the FUP, it's not worth it as I've found they actually enforce it very strictly (3HK at least), and 128kbps is crippling.