Is online learning an evidence-based practice for English and Math using the stringent ESSA rules of Tier 1 and Tier2 evidence-based criteria, such as found in the What Works Clearinghouse?

Yes. 

What Works Clearinghouse, (2021).  (Sahni, S. D., Polanin, J. R., Zhang, Q., Michaelson, L. E., Caverly, S., Polese, M. L., & Yang, J.)  A What Works Clearinghouse Rapid Evidence Review of Distance Learning Programs. ERIC. 

Programs that used more innovative approaches—programs that were adaptive may offer the best opportunity for success in remote learning.

A meta-analysis found that, on average, students in the distance learning programs improved in the English language arts outcome domain.

Additional strong evidence for distance learning improvement in Mathematics had previously been documented by WWC. Citations for Tier 1 and Tier 2 mathematics studies evidence are cited below:

Heppen, J.B., Walters, K, Clements, M., Faria, A., Tobey, C., Sorenson, N., Culp, K, Garcia, G. (2011). Access to Algebra I: The Effects of Online Mathematics for Grade 8 Students. ERIC

Bottge, B.A., Ma, X., Gassaway, L., Toland, M.D., Butler, M. and Cho, S. (2014). Effects of Blended Instructional Models on Math Performance. Exceptional Children, 80 (4), 423–37.