No, the passage does not teach that Jesus is not present with individual believers. This is not the issue in Matthew 18:20, which concerns the value of believers meeting together. Matthew 18:20 speaks of the basis for the hearing of prayer: Jesus’ presence wherever even a few of his people are. Jesus leads his believers in true prayer: praying in his name, obeying his command, and desiring to serve him and join in communion with him. During his earthly ministry, the disciples knew him as One who hears prayers. And so it remains in the church, in spite of his death, which he had already prophesied (Matthew 20:28). In fact, knowing that Jesus can be present wherever even a few are gathered in his name shows his divinity (see 1 Corinthians 5:4), for only God is present everywhere.
No, the passage in no way teaches that Jesus is not present with individual believers, for this is not the issue here in Matthew 18:20, which specifically highlights the value of believers meeting together. Matthew 18:20 speaks of the reason—the basis—for the hearing of prayer, which is that Jesus is present wherever his people are, even if they are only very few in number. By praying in his name, obeying his command, and desiring to serve him so as to enter into communion with him, believers are led by the Saviour himself in true prayer. During his earthly ministry the disciples came to know him as One who hears prayers. And so it will remain in the church thereafter (see Matthew 20:28), in spite of his death which he had already prophesied.1
In fact, knowing that Jesus can be present wherever even a few are gathered in his name testifies to his divinity (see 1 Corinthians 5:4), for none other than God is present everywhere.2
19 Je vous dis encore que, si deux d'entre vous s'accordent sur la terre pour demander une chose quelconque, elle leur sera accordée par mon Père qui est dans les cieux.