[mikem170]

Here's something [0]:

> Next, we showed that patients (n = 23) who recovered from SARS (the disease associated with SARS-CoV infection) possess long-lasting memory T cells that are reactive to the N protein of SARS-CoV 17 years after the outbreak of SARS in 2003; these T cells displayed robust cross-reactivity to the N protein of SARS-CoV-2.

[0] https://pubmed.ncbi.nlm.nih.gov/32668444/

[bart__]

Thank you, seems to support OP's statement. Given that COVID antibody tests also show cross-reactivity with SARS it seems likely to me he is in fact correct.