What is meant by ‘in the days of his flesh’ (Hebrews 5:7)? Can it be said that, at his second advent, Christ will come in the flesh?

This text is from a transcript of a talk by David Gooding, entitled ‘Unity, Origin and Victory’ (1987).

I would suggest that here we start by listening to actual verses. In Acts 1:11 the angels said about the rising Lord to the apostles 'This same Jesus shall so come.' The Jesus, who in the resurrection appeared to them, was a Jesus who said, 'A spirit has not flesh and bone, as you see me have. I do have flesh and bone' (Luke 24:39). Even in the day of his resurrection, as he went up they said, 'This same Jesus shall come again.' How then can Hebrews talk about the days of his flesh? I take Hebrews to be using its term to denote that our Lord now has a resurrection body. First Corinthians 15 explains it: there is a natural body and there is a spiritual body. When our Lord was born here on earth, he had a natural body. Now he has a spiritual body which could pass through doors without the doors opening, you may remember (see John 20:19). So I take it when Hebrews is talking, using its phrase the days of his flesh, it is talking about the days, in other words, when he had a natural body. He doesn't have that natural body now. I take it that the term flesh in that context refers to that natural body, as distinct now from his spiritual body. That spiritual body has flesh and bone, but it is predominantly energised and moves by a different principle. It is a spiritual body, hence the contrast between the days of his flesh and now, the time when he has a spiritual body.