This question establishes that one can contribute to their RRSP without deducting for the year of the contribution.
Additionally, this link from CRA's site has the question "What RRSP, PRPP, or SPP contributions can you deduct on your tax return?" with the answer "your unused RRSP, PRPP or SPP contributions from a previous year"
Does this mean that one can contribute to their RRSP but defer the deduction indefinitely? It seems like yes but taxes are very sensitive and if a rule is interpreted incorrectly, it can result in severe penalties. Hence, my paranoia about this. The language on CRA's website is much more explicit regarding RRSP contribution limits and carry forward rules and time frames.
If you have a CRA link that specifies the answer to this more explicitly, that would be appreciated. Please answer this only if you are very knowledgeable about taxes.