It helps establish which chemicals contacted which materials. 'Oven cleaner' can describe products with very different instructions and restrictions.
What the observation means
The person assessing a changed surface, control or smell needs the sequence rather than a guessed explanation. Mixing products or using them on hot equipment is especially relevant information.
A useful next step
Retain the label and tell the engineer where it was used. Do not repeat the application to reproduce the effect or add another chemical to neutralise it without authoritative directions. Stop using the cooker if fumes, smoke or electrical symptoms remain.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.