Is it correct that it is expected from an investor to have all the information needed in the temperature rating approach available himself, which in practice might prove to be quite challenging for e.g., large equity portfolios?

Methods
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I think this is a major obstacle to committing to setting a SBT.

I have yet not been able to find the same data between various sources and not a single provider holds all data readily available to apply to the calculation tool.

In addition, I also find it difficult (impossible?) to convert companies target reductions into the format. Especially odd intensities seems hard to enter - and maybe also for the tool to understand.

Finally, I do not think that the tool and the data required are very well explained. I listed a number of questions here: SBTi-Finance Temperature rating: Streamlining data used for calculating the temperature rating - Tools - Science Based Targets for Financial Institutions