I understand what the writer was trying to convey; I also think that two of his references require a bit of stretching.
Rev 1:4 describes seven spirits before the throne of God; the writer is making the assertion that these seven spirits are angelic, and that the reason why they are in front of the throne is to offer to God the requests of God's people---i.e., they are
interceeding for God's people. It's a bit of a stretch, but taking the verse in context with everything else the Church teaches about intercession of saints and angels, you could come up with that interpretation. It's not a verse that I personally would use as a proof-text for this particular doctrine, but okay.
Rev 5:8 describes twenty-four elders in front of Christ, each holding a golden bowl full of incense, which are the prayers of the holy ones. The assertions here are that the elders are angelic (or possibly saints), and that the holy ones whose prayers they are offering to Christ are Christians on earth. This one is a little more closer to home as being a text I would use.
Finally we have Rev 8:3-4, which describes an angel offering incense and prayers of the holy ones, which ascend to God from the angel's hand. Again, if we understand that the "holy ones " mean the Christians on earth, then the prayers being offered by those Christians are being presented by the angel. This is the proof-text I would use if I were explaining the doctrine of the intercession of saints and angels.
Does this help?