iOS has lots of security and sandboxing. If you are not at the OS level, you really shouldn’t be able to intercept app notifications and it would be beyond terrible if you could then intercept them and act on them.
With regards to Shortcuts and IFTTT. IFTTT is triggering a notification to the IFTTT iOS app. You should be able to send a lnk in an SMS or another service (e.g. Pushover) if you need to, but it is never going to be direct to Shortcuts; unless Apple changes something to allow this sort of notification triggering.
Whatever the case, the security is such that Apple require a user validation before triggering an action. i.e. the user has the opportunity to review the link to ensure it is not malicious in nature, before triggering it.
If you are unsure as to whether to create a new thread on something, first search the forum. If you don’t find an answer and your question is not directly related to a the original question on a thread, start a new thread. You can always reference back to the original thread if you are taking a tangent. This approach will ensure things stay on topic and that others can easily find and consume the discussion rather than having to pick it out in bits and pieces from some gargantuan thread.
If you start a new topic, and someone else finds a topic that is directly applicable, they will post a reply directing you to the answer in the original topic. But any further discussion should then really proceed on your own new topic as that’s what is then driving the conversation.
At least that’s how pretty much every other forum I’ve ever used or admin’d) has worked.
Whe in doubt, refer back to the FAQ, and in particular, the Keep It Tidy section which gives a nice brief summary of what is expected for forum users on this sort of thing.
Hope that helps.